So it's still happening with every piece of CC? Very odd. I have no idea what the problem can be. I've only ever seen it when the Sims 4 folder is stored externally and the external drive is incorrectly formatted as FAT.
@Bluebellflora i actually solved the problem by te downloading every corrupted cc ! I don’t know what happened the first time I downloaded them but it’s working now ! thanks for your help