Edit: IT FIXED ITSELF I WAS GONNA TRY ONE OF YOUR IDEAS AND BEFORE I TRIED IT I CHECKED MY STEAM DECK AND ITS FIXED :D
Edit 2: it started happening again ):
Edit 3: after trying random stuff (factory reset, removing decky loader ect) i found out its not "a stuck button" or anything its a problem with software because i tried taking it to repair and they cleaned the button and it did absolutely nothing and anything i tried did nothing so ig im gonna use desktop mode because it only happens in the steam ui (sometimes its fixed for some time and it breaks again)
Edit 4: my final effort to get this steam deck working i tried to contact valve support and basically it was unessary... they tried to give me things to try and after i responded they said the couldn't troubleshoot my problem further... they told me they could ship a new replacement device but... because im in qatar they can't help me further, i spent so much money on this device... ):
this issue came out of nowhere, the main issue i have is related with "steam" and "..." buttons its where steam thinks im spam clicking/holding them so the menu keeps showing up and sometimes shows the shortcut menu (especially when turned on) and when the "steam" and "..." buttons dont seem to be detected holding/spam clicking it those buttons dont work and trigger random shortcuts (example: shortcut "steam" button + left joystick will force the joystick to change my brightness instead of navigating a ui/moving in a game)
the "steam" and "..." buttons detected spam clicking/holding is not as common as random shortcuts being triggered so i only got a picture of proof that the "steam" button is randomly getting held and the shortcuts menu is showing up This problem is annoying.
I might try this tommorow (sorry for delayed response)