Why are my mobile product images blurry on the Dawn theme?

[Ha10]

Hello 
I'm having an annoying problem with product images and (text and image) images for mobile view only , the images are perfect on desktop but on mobile they are blurred .
I've seen some answers but nothing worked for me , I've tried PNG and JPG format , I also tried with high and low resolution , I tried with sense theme but same .
any ideas ?

my store's URL : https://cb3f53.myshopify.com/

[Newbys]

Same issue