Changing the site url

I had a different URL for my wordpress blog during the development stage — that url was https://www.isthatweird.net/dev/

When I made the site live a while ago, I changed the URL and moved all the wordpress files to the main directory so that the site is now accessed by https://www.isthatweird.net/

Everything seemed to have worked fine, but I noticed that a plugin (the sidebar login) is still using an the old isthatweird.net/dev/ url.

I’ve checked everywhere that I know of to make sure that calls for the isthatweird.net/dev/ URL have all been removed and they have been. I even looked at the plugin language and it calls for “echo get_bloginfo(‘wpurl’)”

Any idea why this is still coming up as the old URL? I hope I didn’t make this question sound completely impossible. If so, let me know and I’ll try my best to simplify it.