Why do deleted devices reappear on my Apple ID?

NylaNyla wrote:

So, rather than telling us how to check the devices connected to our AppleID, because clearly, we already know this, that’s why we’ve asked the question… WHY are there multiple phones connected to my Apple ID when I’ve checked and deleted, only to find multiple phones again, the next time I check??? And with Apples “top security” measures, how is it that this keeps happening?? It would be great to get a reply that actually helps explain why this is happening and how to prevent it, rather than telling me what I already know! 👍🏼🤞🏼

So what happens when you sign out of your apple id instead of deleting it?