Add-ons reappearing after being removed

Hello There.

I was wondering if anyone could offer some advice.

I have gone through my kodi and removed Add-ons that I don’t use. I went through the settings, clicked on the add-on, disabled the add-one and then uninstalled it. Once completed it was nice to see Add-ons on the screen that I only really use. After a few days the add-ons that I have removed had all returned.

Is there something that I have missed to stop this from happening?

Many thanks in advance