photos downloaded fro phone to desktop are blurry
I had some photos sent to me from an iPhone 12 via text to my iphone SE. I downloaded them to my desktop photos and they are all blurry or bitmapped looking - except one. Why is this and how do I fix the photo? Is it something in the phone settings? They say jpeg and not heic. When I see them on the phone or in the text they look fine. It is when you send them to the computer an look at them . I want to print out a photo and it's not going to look good.
iMac 27″, macOS 10.13