When I search them, it says I own them so I still own them I just cannot see them anywhere.
I purchased them all from Origin so there’s no way there’s anything wrong with them
You will not normally see them in the library.
But to see what expansions packs you have you can just simply go to your library and press on sims 3 game. Then on the right side you will see the button “play” . Bellow that you can choose one of the three options and can access to all of your expansions packs owned. If you see them there and it says that those are downloaded/purchased then you can do few steps for them to work.
you can either repair the sims 3 and it will checks and sort all expansions packs or try to update it. If not you can repair or install individual expansion pack as those may not be installed for some reason . If that doesn’t work try to clear the cache files from origin. I will drop the link for the instructions.
https://help.ea.com/en-gb/help/faq/clear-cache-to-fix-problems-with-your-games/
I hope this can help you.
