Sticky sections not working on mobile

Hi!

I have "sticky" sections that seem to be working great on desktop but not on mobile.
Some of the remaining blocks below appear to be scrolling underneath the "sticky" sections, and some images are even floating on top. It's kind of a mess.

Any ideas?

https://privatemortgages-ottawa.squarespace.com/
password: private

@tuanphan Are you able to help with this? 🙂