I'm trying to create a category for my posts, but WordPress automatically adds a -2 behind it (example: Keyword -> keyword-2).
When I tried to check if maybe a post or page with the same keyword exists, WordPress automatically redirects me to a certain blog post that starts with the keyword, say example.com/keyword -> example.com/keyword-post-whatever.
I tried to delete this post (and empty the trash) to fix this problem, but WordPress then automatically redirects to another post, like example.com/keyword-second-post.
Any ideas how to fix this? I tried deactivating all my plugins, but the same "bug" appears.