@saralukka If it works correctly without the Mods/CC then you know that something within them is causing the issue. Leave the game without saving.
Then begin testing by re-adding them one at a time* (and deleting the localthumbcache.package file each time, as mentioned in the previous directions), then entering the game (after each one is re-added) and seeing if the issue is present. It's best to do this all in a new/clean/vanilla game save. Do not save in-between the tests.
*If you have a lot of Mods/CC you can use the 50/50 method to save a lot of time.
When you find the culprit try adding all of the rest of the Mods/CC (all at once), and deleting the localthumbcache.package file, without the problem Mod/CC, and see if the issue reappears (in case there is an additional problem Mod/CC). If the issue is still gone with the rest of the Mods/CC in the game, you know the (one) problem Mod/CC. Then you can leave without saving and check if the Mod/CC has an update. If it does you can test in this save to see if the updated version addressed the issue. If it did not address the issue, leave without saving and leave the problem Mod/CC out of your saved/normal game and just add back in all of the Mods/CC that did not cause the issue. You could contact the creator of the Mod/CC and let them know about the issue.
When you find which Mod/CC is causing this issue it will help others if you list it here in this thread. 🤞🏼