Gallery Sims Reverting Back... Help :(

Hello all, I hope all is well. For awhile now I have been playing the sims on my macbook pro. I have a household that I just made yesterday and started playing. One of my sims happens to be from the gallery. Every time they shower, change clothes to sleep, or even travel, their clothes keep reverting back to what they were originally when I had downloaded them from the gallery. I have absolutely no mods installed on the game, I have deleted and reinstalled my game and the issue still persists. I have even tried to redo the save, meaning starting over and it is still happening to the same sim. There is two sims in this household. One I made, the other I didn't. This is only happening to the one I did not make. Please help, this is driving me insane!! :(