New bulk redirect links not saving

So the bulk redirects were working great for me before (yesterday). I added 8 of our blog posts to redirect them from our old website, and they were added successfully. However, for some reason, now whenever I try to add a link, then hit save, the save button just loads forever and doesn’t actually add the redirect.

I’ve tried clearing all my cookies, and tried doing it in an incognito tab, but neither of those worked. I started to have the issue yesterday, so I moved on when it happened and hoped it would work 24 hours later. Unfortunately, leaving it for the day didn’t help either.

Is there some other issue that could be happening here?