The only thing I can think of is to remove the mods folder to the desktop and delete the game cache and localthumbcache.package file from your Sims 4 folder, and repair the game (In Origin > Games Library, right-click on Sims 4 and select Repair.) to help troubleshoot the issue.
Try a new test game and have a Sim paint from reference to see what happens.
If you've already tried that, you may need to report it to AHQ Sims 4 Bug forum -
https://answers.ea.com/t5/Bug-Reports/bd-p/The-Sims-4-BugsThis was reported as fixed in a patch awhile back, but if you are still having issues with this, best you can do is report it to the Bug forum.