Elementor background incompatibility with Safari

Hello Everyone !! 😊😊

I have a little problem incompatibility between Safari and Google Chrome on mobile-only (I mean real mobile not responsive dev mode on Google Chrome).

I don’t know why but the background image is blurry as hell only on iPhone Safari mobile (Tested on IPad / iPhone 7 8 8 Plus and iPhone 11 and 12).
Everything works fine on Chrome only Apple Device are blurry.

My background config : center center fixed no-repeat contain
I tried with cover but it’s worse

Theme used : Astra (I tried Twenty One but it’s worse lol)

I also tried to deactivate plugin and activate them 1 by 1 nothing change.

I don’t know if anyone has had this problem before. But if someone has an answer to it

Thanks in advance for your help!
Have a nice day everyone

Here is pic of the problem :

On Android :
http://image.noelshack.com/fichiers/2021/23/5/1623422569-198463388-10227472647749023-5688132152364583968-n.jpg

On Safari :
http://image.noelshack.com/fichiers/2021/23/5/1623422572-198420139-10227472647429015-1882725245294861993-n.jpg

The page I need help with: [log in to see the link]