WordPress automatically zooms images on upload

I got a weird problem: When I upload a image, sometimes WordPress zooms it in automatically. However: the dimensions remain the same. So let’s say I upload an image of 244×501 pixels, it stays 244×501 pixels according to WordPress, but it is CLEARLY zoomed in bigger than original (by about 25%), and therefore blurry. It doesn’t always happen, just sometimes. I’m not trying to upload extremely big or small images or something. I also tried to turn off all my plugins and switching theme’s, but didn’t work. I tried saving as different format (jpg, png etc.), also didn’t work. The problem has to be with the WordPress library/uploader… It looks like it does upload the original size, but then shows it zoomed in on both the library and in the actual post (in the block editor already, so it’s not a CSS problem). So it says for example 244×501, while in reality it’s something like 302×627 or so…