@Lydiaxox it sounds like you have some broken or missing files. You can use Sims 4 Studio to find them.
You will need a membership to download Sims 4 Studio but, it is free http://sims4studio.com/
Once you have installed the program. choose My CC from the main screen. A new window will open and you will be able to see pictures of your CC. On the left, there will be a list of all of your CC. You can go through your items one by one and in the picture window, the CC will appear as it does in the game. You can then delete the item with the delete button on the bottom right. It will remove the item completely from your game.
Since you are able to see the item name in the list on the left, you can find the original website and re-download the item, if you wish.