Yes - that is normal - only your manjaro partition is encrypted - but the grub loader including the operating system selector is inside that partition
This is because grub boot loader is inside the encrypted partition and that is why you must decrypt your Manjaro partition even though you want to boot windows.
So use the firmware boot override - just like you would in an install situation - select windows or manjaro.
Another solution is to use systemd boot - as this also provide a window of selecting the operating system. There is no fancy customisation - simplicity is the keyword.
→ [How To] Convert to systemd-boot
A third solution is to create an installation with an unencrypted boot
→ [root tip] [How To] Use Calamares to install encrypted root using unencrypted boot