Problem with hamburger menu in phone navbar when scrolling

Hello everyone,

I hope you are doing well. I am facing an issue with my hamburger menu on mobile portait. When I scroll down my page and try to open the drop-down menu, it opens it at the top of the page (so you can’t see it if you are not at the top of the page).

Do you now how I can fix it?

Here is the link to my website: Webflow - Calvine website

Thank you very much for your help.

Valentin