Trouble collection showing blurred per default

Hello,

I use the last version of dawn theme, on the main page the featured collections are displayed per default blured, then after if I click on it to go on product page and come back , this is clear one time on two.

Can anyone help please, the pictures before :

And the first picture is clearer :

I would like thise quality for all and per default.

If you manage to help me consider a fair disount by 50% of one article, minus taxes and expedition fees.

Thank you

Best regards

Baptiste Maubert