Wacom pen pressure not working, brushes acting strangely
Can someone help me understand what is going on here?
I use a Wacom Intuos Pro and Photoshop 2025 on Windows 11 to draw. Everything was working fine until two days ago when the pen pressure suddenly stopped working. However it hasn't stopped working entirely - instead it acts strangely. Photoshop seems to be able to detect pen pressure and manifest it when the brush is large, but when the brush is small it's like one size only and looks very aliased. I have a recorded a video of what I mean: https://imgur.com/a/769iT8u
In the video, on the left you can see a pair of legs I drew days ago with a size 4 hard round pressure size brush. You can see that the lines are soft and feathery. At the start of the video, I attempt to make the same kind of lines using the exact same size 4 hard round pressure size brush. You can see these lines are blunt and don't seem to be able to get very small.
Also, when I switch to the soft round pressure opacity brush at a large size, it looks really weird as well. I don't even know how to explain it but it looks like it's just drawing circles. Changing the spacing does not help.
Screenshot in case the video doesn't work:

Things I have already tried:
Uninstalling and reinstalling the latest tablet driver
Uninstalling and reinstalling an older version of the tablet driver
Uninstalling and reinstalling Photoshop
Turning off Windows Ink
Turning back on Windows Ink
Turning off Windows Ink and using a PSUserConfig.txt file
Nothing has worked so far.
Please help?
Thanks in advance.
