When there is a patch update, sometimes cc is broken. There are sometimes batch fixes released for cc items, and cc creators also release updated versions of their cc. Because you have many cc items and are not sure where you downloaded some of them from, some of them may have become out of date/broken.
You could try just putting in your cc that you use a lot into the mods folder , and see if the issues remain. If the issues remain, then you could go back to the website of those cc that you know that you downloaded the cc from and see if other simmers have had issues or if an updated version has been released.
