Custom Portrait works in BG2:EE but not BG:EE

I edited a bunch of the original portraits from BG to make some variations from the originals. In BG:EE they work in the character creation screen, and the character page in game, but not on the side bar or the party screen (when making a party of custom characters). I used GIMP and exported them as Windows BMP files with 24-bit format.

In BG2 there seems like there is no problem.

I tried downloading a custom portrait from the internet, and that one works in BG:EE. I'm not sure what I did differently with my own portraits such that they don't work.

Both game versions are v2.3.67.3. My games are are modded with CDtweaks and a few other mods for kits. It's on my Windows 10 PC.
Any idea what I can do to fix it?

In BG2 there seems like there is no problem.

I tried downloading a custom portrait from the internet, and that one works in BG:EE. I'm not sure what I did differently with my own portraits such that they don't work.

Both game versions are v2.3.67.3. My games are are modded with CDtweaks and a few other mods for kits. It's on my Windows 10 PC.
Any idea what I can do to fix it?
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Hope that helps someone else.