Website Header Displays Issues w. Chrome & Edge

Hello,

I was recently charged with updating this website (jeanbateman.com), but I don’t have much knowledge of WordPress and didn’t build it, so I apologize for my ignorance and lack of knowledge in advance.

I’was alerted that the website’s header menu does not display properly in Chrome and Edge. It does look the way it’s supposed to in Safari. In chrome the header menu is too wide, covers the top section images on every page and the icons on the left are all off. I’ve tried cleaning cache and deactivating some plug-ins, which didn’t work. I don’t see the option to install the previous version under my updates – only reinstall 5.9.3 – didn’t help. What can I do to fix it?

Thank you for your help!

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