Webcam in videocalls looks wrong

Steps to reproduce:

Conected my Sony a6000 with a video usb capture card to use as a webcam, i’ve used it in Firefox, Chrome websites and apps.

Actual results:

In chrome works fine, but in Firefox and OBS Studio the video looks cropped (2 side black bars) in all the services, but also looks with wrong proportions, scaled in width smaller in Discord.

Also, when i connect my webcam in discord, it looks ok in the settings, but when in a videocall, it also gets cropped :S don’t know why :S

Firefox Google Meet:

Firefox Skype:

Firefox Discord Webcam:
Firefox Discord Sony a6000:
OBS Studio: