Gallery block – issue with Safari

In this page, I work with gallery blocks. It displays perfectly well on my computer but it doesn’t work on a Ipad or a Imac : the photos within the gallery are of different sizes and they get out the block zone. As a result you can’t see the titles anymore and it all lokks messy.
My understanding is that there is a conflict with Safari.
I have another page with Gallery blocks and I have the same problem:
https://www.sylben.net/accueil-option-4/

FYI,
WP 5.5.3
theme : Customify, but I tried with theme 2021 and got the same layout problem on imac and Ipad

Could you please help with that issue?

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