[Plugin: Regenerate Thumbnails] Inconsistent allocation of thumbnails in admin

Hi – I just processed a big batch of image uploads and found that when viewing the images in the media library admin some thumbnails appear as cropped squares (150×150) whilst others are actually full sized versions of the images (though obvs re-sized by CSS to fit on the library table).

I’ve tried hitting regenerate again but nothing changes. If I check the folder on my host all the thumbnails are there as they should be.

How do I get WordPress to display thumbnails consistently?

https://www.ads-software.com/extend/plugins/regenerate-thumbnails/