Hi! I'm also having this problem with small logo image blocks and logo walls that I use on the bottom of my home page, one of my bio pages, and my contact page. The logos look small and correct on desktop but fill the entire screen on mobile.
URLs here: https://sawfish-parrot-dswf.squarespace.com/
https://sawfish-parrot-dswf.squarespace.com/contact
https://sawfish-parrot-dswf.squarespace.com/attorneys/kevinlundholm