Problems with GRUB Bootloader

Good evening in the Manjaro community.

I have the distribution installed on my machine, worse, after a power surge I started having problems booting the operating system.

I used the pendrive bootloader to later restore the system by timeshift and realized that the problem was in GRUB.

After restoring the system and GRUB, I would like to know if it is possible to have more than one GRUB on the hard drive and if so, how do I identify when GRUB has it and how do I remove them and leave only one, which is working normally.

Hugs…

Increase your chances of solving your issue:

Provide Information:

System:
  Kernel: 5.10.89-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
    parameters: BOOT_IMAGE=/boot/vmlinuz-5.10-x86_64
    root=UUID=4c99a061-31b7-445a-ad39-2ef99ad4a052 rw quiet
    udev.log_priority=3
  Desktop: LXDE 0.10.1 info: lxpanel wm: Openbox 3.6.1 vt: 7
    dm: LightDM 1.30.0 Distro: Manjaro Linux base: Arch Linux
Machine:
  Type: Desktop Mobo: INTEL model: H81 serial: <superuser required>
    UEFI: American Megatrends v: 4.6.5 date: 10/21/2020
Battery:
  Message: No system battery data found. Is one present?
Memory:
  RAM: total: 7.71 GiB used: 871.9 MiB (11.0%)
  RAM Report:
    permissions: Unable to run dmidecode. Root privileges required.
CPU:
  Info: model: Intel Pentium G3250 bits: 64 type: MCP arch: Haswell family: 6
    model-id: 0x3C (60) stepping: 3 microcode: 0x28
  Topology: cpus: 1x cores: 2 smt: <unsupported> cache: L1: 128 KiB
    desc: d-2x32 KiB; i-2x32 KiB L2: 512 KiB desc: 2x256 KiB L3: 3 MiB
    desc: 1x3 MiB
  Speed (MHz): avg: 1036 high: 1274 min/max: 800/3200 scaling:
    driver: intel_cpufreq governor: schedutil cores: 1: 798 2: 1274
    bogomips: 12777
  Flags: abm acpi aperfmperf apic arat arch_perfmon bts clflush cmov
    constant_tsc cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64 dtherm dts epb ept
    ept_ad erms est flexpriority flush_l1d fpu fsgsbase fxsr ht ibpb ibrs
    invpcid invpcid_single lahf_lm lm mca mce md_clear mmx monitor movbe msr
    mtrr nonstop_tsc nopl nx pae pat pbe pcid pclmulqdq pdcm pdpe1gb pebs pge
    pln pni popcnt pse pse36 pti pts rdrand rdtscp rep_good sdbg sep ss ssbd
    sse sse2 sse4_1 sse4_2 ssse3 stibp syscall tm tm2 tpr_shadow tsc
    tsc_adjust tsc_deadline_timer vme vmx vnmi vpid xsave xsaveopt xtopology
    xtpr
  Vulnerabilities:
  Type: itlb_multihit status: KVM: VMX disabled
  Type: l1tf
    mitigation: PTE Inversion; VMX: conditional cache flushes, SMT disabled
  Type: mds mitigation: Clear CPU buffers; SMT disabled
  Type: meltdown mitigation: PTI
  Type: spec_store_bypass
    mitigation: Speculative Store Bypass disabled via prctl and seccomp
  Type: spectre_v1
    mitigation: usercopy/swapgs barriers and __user pointer sanitization
  Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional,
    IBRS_FW, STIBP: disabled, RSB filling
  Type: srbds mitigation: Microcode
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: AMD Baffin [Radeon RX 460/560D / Pro 450/455/460/555/555X/560/560X] vendor: XFX Pine driver: amdgpu v: kernel bus-ID: 01:00.0 chip-ID: 1002:67ef
    class-ID: 0300
  Display: x11 server: X.Org 1.21.1.2 driver: loaded: amdgpu,ati
    unloaded: modesetting alternate: fbdev,vesa display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2")
    s-diag: 582mm (22.9")
  Monitor-1: HDMI-A-0 res: 1920x1080 hz: 75 dpi: 82
    size: 598x336mm (23.5x13.2") diag: 686mm (27")
  Message: Unable to show advanced data. Required tool glxinfo missing.
Audio:
  Device-1: Intel 8 Series/C220 Series High Definition Audio
    driver: snd_hda_intel v: kernel bus-ID: 00:1b.0 chip-ID: 8086:8c20
    class-ID: 0403
  Device-2: AMD Baffin HDMI/DP Audio [Radeon RX 550 640SP / RX 560/560X]
    vendor: XFX Pine driver: snd_hda_intel v: kernel bus-ID: 01:00.1
    chip-ID: 1002:aae0 class-ID: 0403
  Sound Server-1: ALSA v: k5.10.89-1-MANJARO running: yes
  Sound Server-2: JACK v: 1.9.19 running: no
  Sound Server-3: PulseAudio v: 15.0 running: no
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
    driver: r8169 v: kernel port: d000 bus-ID: 03:00.0 chip-ID: 10ec:8168
    class-ID: 0200
  IF: enp3s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
  IP v4: <filter> type: dynamic noprefixroute scope: global
    broadcast: <filter>
  IP v6: <filter> type: dynamic noprefixroute scope: global
  IP v6: <filter> type: dynamic noprefixroute scope: global
  IP v6: <filter> type: noprefixroute scope: link
  WAN IP: <filter>
Bluetooth:
  Message: No bluetooth data found.
Logical:
  Message: No logical block device data found.
RAID:
  Message: No RAID data found.
Drives:
  Local Storage: total: 223.57 GiB used: 78.71 GiB (35.2%)
  SMART Message: Required tool smartctl not installed. Check --recommends
  ID-1: /dev/sda maj-min: 8:0 vendor: Kingston model: SA400S37240G
    size: 223.57 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
    type: SSD serial: <filter> rev: 61K1 scheme: GPT
  Message: No optical or floppy data found.
Partition:
  ID-1: / raw-size: 223.27 GiB size: 218.77 GiB (97.98%)
    used: 78.71 GiB (36.0%) fs: ext4 dev: /dev/sda2 maj-min: 8:2 label: N/A
    uuid: 4c99a061-31b7-445a-ad39-2ef99ad4a052
  ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%)
    used: 300 KiB (0.1%) fs: vfat dev: /dev/sda1 maj-min: 8:1 label: N/A
    uuid: 84A3-A666
Swap:
  Alert: No swap data was found.
Unmounted:
  Message: No unmounted partitions found.
USB:
  Hub-1: 1-0:1 info: Full speed or root hub ports: 2 rev: 2.0 speed: 480 Mb/s
    chip-ID: 1d6b:0002 class-ID: 0900
  Hub-2: 1-1:2 info: Intel Integrated Rate Matching Hub ports: 4 rev: 2.0
    speed: 480 Mb/s chip-ID: 8087:8008 class-ID: 0900
  Hub-3: 2-0:1 info: Full speed or root hub ports: 2 rev: 2.0
    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
  Hub-4: 2-1:2 info: Intel Integrated Rate Matching Hub ports: 6 rev: 2.0
    speed: 480 Mb/s chip-ID: 8087:8000 class-ID: 0900
  Hub-5: 3-0:1 info: Hi-speed hub with single TT ports: 10 rev: 2.0
    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
  Device-1: 3-9:2 info: Dell KB216 Wired Keyboard type: Keyboard,HID
    driver: hid-generic,usbhid interfaces: 2 rev: 1.1 speed: 1.5 Mb/s
    power: 100mA chip-ID: 413c:2113 class-ID: 0300
  Device-2: 3-10:3 info: [Maxxter] Optical Gaming Mouse [Xtrem]
    type: Mouse,Keyboard driver: hid-generic,usbhid interfaces: 2 rev: 1.1
    speed: 1.5 Mb/s power: 100mA chip-ID: 18f8:0f97 class-ID: 0301
  Hub-6: 4-0:1 info: Super-speed hub ports: 2 rev: 3.0 speed: 5 Gb/s
    chip-ID: 1d6b:0003 class-ID: 0900
Sensors:
  System Temperatures: cpu: 29.8 C mobo: 27.8 C gpu: amdgpu temp: 31.0 C
  Fan Speeds (RPM): N/A gpu: amdgpu fan: 1340
Info:
  Processes: 159 Uptime: 1m wakeups: 0 Init: systemd v: 250 tool: systemctl
  Compilers: gcc: 11.1.0 Packages: pacman: 742 lib: 211 Shell: Zsh v: 5.8
  running-in: lxterminal inxi: 3.3.11