Mobile page not working correctly on iPhone

Hi!

My website is not working completely on some phones, especially iPhones. There are two problems with it:

1. The menu doesn’t open.
2. The blog posts don’t show.

This doesn’t seem to be the case for all iPhones though. Does anyone have an idea how I could fix this when the problem seems to be so specific?

Thanks in advance!

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