Hi Tori,
Thanks for getting in touch, sorry to hear about the trouble with the thumbnails!
Thank you for outlining what you’ve done so far, that helps a lot to narrow things down.
It looks like there are three recent ones that are sized correctly, but as counterintuitive as this sounds, the ones that are oversized seem to be due to the fact that they were edited to a smaller size prior to their thumbnails being generated (or regenerated).
Using the most recent oversized one (Chipotle corn salad- looks amazing btw!) as an example, the current image is too small for thumbnails to be accurately cropped from it. This is the current, edited version, which is only 480×560:
IMG_0203-e1651537591701.jpg
That “-e1651537591701” is what shows that it’s an edited version. But the original (IMG_0203.jpg) is 1756×2048, which is plenty big enough to generate correct thumbnails. If you can switch the featured images back to the unedited original images and then run the thumbnail regeneration again, it should resolve this.
Also I just noticed that you’re using the Pro version of the theme…forum rules don’t allow us to offer Pro support here, but if you can get in touch with us we’d love to help out further with this issue if you need it:
https://www.lyrathemes.com/support/
Thanks again!