We dont know anything about what you did, and saying ‘some guides’ does not help much.
Drivers in manjaro are handled through mhwd … did you use that, or did you do something else?
If it was something else please be explicit. We might already know it was likely ‘wrong’ … but to what extent? If you manually downloaded something from some website and ran it then that may not be recognized by the regular means (pacman, mhwd, etc).
For now … we can at least get system information (and what mhwd sees)