There is a character that is using an older version of that mod, most likely. These mods are saved to the cards down to the exact version applied when the card was last saved and BepInEx is looking for a version match between the game files and the card. If the card has a different version than what BepInEx is looking for, it will show these warnings.
As for fixing it, find the mod on the card, replace it with the version in your game files, save the card again.
Raise the girl's sex experience, this will unlock more positions and actions.
The game has been complete gameplay wise for a long time now, everything that gets updated at this point is mods.
You download all parts, make sure they are all in the same place, then use a program like WinRAR or 7zip (make sure these are up to date or they may give errors even with no actual problem in the file) to extract them specifically using the first file to start it (the rest will do this in order on their own from there).