Why do my cover images become blurry after uploading?

Our cover images looks fine when first uploaded, but after a couple of minutes, when visiting our site the images apear very blurry..

I’ve attached 2 images, both snipped at the same time on the same site, one images is very blurry and the other is not.. When we first uploaded the blurry image it looked fine..

Hi @MarcesMochia ,
Can you kindly share your store link (with the password, if any) with us? We will check it and suggest you a solution if possible.