iMac Big Sur, Magic Mous, Bridge 18.104.22.168
When I scroll up, the display of the image thumbnails goes down. And the other way round.
Scrolling follows whatever is set system-wide.
No. It's true with Lightroom, Photoshop. But it's wrong with Bridge.
I use Bridge on both Mac (Big Sur currently) and Windows 10 and it works for me.
This is how its supposed to work. The scroll bar goes up and content goes down.
Have you tried going into your OS preferences and "unchecking" this option under "Mouse"?
For many many many years pulling the scrollbar down made the window's contents scroll down. Then Apple felt that it wasn't natural so they reversed it. (Sadly, not everything that Apple does is smart or well reasoned). I believe once you "fix" this, Bridge will be working properly.
Windows 10 has the same thing, believe it or not.