When I try to bulk redirect urls the source url box is populated with IPs

As per title; when I select multiple 404 urls and attempt to redirect in bulk, the pop-up populates the URL box with the IPs instead of the URLs.

See screenshot: https://pasteboard.co/HNtVgzG.png

I simply select a lot of 404 urls then click Bulk Actions > Redirect All

Am I doing something wrong?

If not, do you have any ideas why this is happening?

Thanks