Blurry pictures in camera roll until zoomed in
Recently a problem occurred: when taking a picture and looking at it in my camera roll, the picture looks blurry/unsharp. When zooming in, the picture becomes fully sharp. I did not have this problem in the past - old photos are still sharp in my camera roll. In settings > name > iCloud > photos > “download and keep originals” is selected and has been selected all the time. How can I solve this problem? I have an iPhone 8, that is 1 year old - ios 13.3
Thank you in advance for your help.
iPhone 5, iOS 10