The problem is that it hasn’t always been like this. I installed Hestia in mid-June and the photos have always looked good. It’s been happening for about two weeks. I’ve always uploaded the 650px photo and they looked great, I don’t know what happened.
By the way, in the old articles there are even larger photos and they still look male. I don’t know what to do, also because in a travel blog the images are an important part!
PS. I add that when I upload them they are very visible, as soon as I insert them into the article they become blurry.