[Stable Update] 2020-10-01 - Kernels, Mesa, KDE-Framework, Deepin, Systemd, Pamac, Xorg-Server, Qt

see this

boot on USB iso manjaro
do chroot ( sudo manjaro-chroot -a )
check list kernels installed & files /etc/mkinitcpio.d/*.preset

i think you should remove 5.7.preset
and then redo mkinitcpio for others

sudo manjaro-chroot -a 
ls /etc/mkinitcpio.d/*.preset
mhwd-kernel -li
rm /etc/mkinitcpio.d/<name57>.preset
mkinitcpio -P 
update-grub
exit

then reboot

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