SmidgeCake

I've just started a new server just for me and my friends and I had a few worlds to start with just because I wanted to import my own world after already creating one for the server. So my overworlds are World A (the default server's), World B (A failed uploaded world) and World C (The world that I want). I deleted world A, however, World B wouldn't delete because it apparently doesn't exist even though it shows up in the /worlds list. I did /setspawn in World C which worked until I logged out and logged back in again. I keep spawning in random places even when saving the server's world with /save-all, I'm not sure how to fix that as it is, but another problem is that my deleted worlds don't stay deleted. World A is still there and World B just won't delete from the list. If anyone can help, that would be great. Thank you.