I may not know why this issue occurs but I have a guess on how to fix it. I apologize if it doesn’t work.
Go to layout - edit mode - button shown on picture - face orientation
In the inverted mesh, the texture always paints on the opposite side of where you’re painting. As for the non-inverted mesh, the texture is painted properly. So, basically you just have to flip the normals in order to paint the textures properly. In other words, that should mean it works once the everything has been flipped
I hope this explanation makes sense and works! I can further explain if you want. Then again, you can probably get much better help from other people.
You may want to try a Blender forum, not the Roblox forums. Or just do an internet search for your issue since there are tons of Blender tutorials available out there.
You’d get much better help there. Imagine the response you’d get asking questions about Roblox Studio on a Blender forum.
This doesn’t seem to work. When I turned on face orientation the whole object was covered in blue like it was supposed to be. I thought switching to red would be the solution but when I started painting it became less accurate than the previous tries.