Plugin generating thumbnails that don’t exist.

Hey there!

It’s hard to say what’s happening in your case. Maybe do you have some custom filters on your site? Or plugins/theme that can be conflicting with Regenerate Thumbnails? I’d recommend you disable custom filters, plugins, and your current theme, in order to see if the issue is fixed. So maybe you could figure it out what’s happening in your site.

Also, you can check how are the sizes in your WP-admin > Settings > Media.

I hope it helps you. ??

I have no idea why it was creating them–that size didn’t match any of the sizes in the media settings page. I added custom code to unregister pretty much all the image sizes and regenerated again and the mystery sizes didn’t show up. I don’t know what plugin was calling them but I got it there in the end.