Bug: Image displays as wrong size/poor quality

An image I uploaded is the wrong size and poor quality, I know I uploaded the correct one (there is only one copy of the image in my files and it is different than how it uploaded). I figured maybe it was just "loading" the full resolution version but it's been 12 hours and it's still the same lower resolution and quality. Both images should be the same size/quality, which is the case in my files, but not here on Primfeed.

This is the post in question (the second image should not be a different size/quality than the first): https://www.primfeed.com/nicky.macabre/posts/9ab19712-c5fc-4433-b5a5-5f06593626ac