Dropdown in burger menu


I was wondering if anyone can help with an issue I have regarding a drop-down I have added to the burger menu. It works, but if I select the dropdown I’ve added (VR Headsets) using my iPhone, it will only show part of the burger menu list and I am unable to scroll down to see any of the remaining links.

Here is my site Read-Only: https://preview.webflow.com/preview/vrone?utm_medium=preview_link&utm_source=dashboard&utm_content=vrone&preview=bdb9cdb9c744fdbae8c90cd5c5a681ef&mode=preview

Any ideas anyone?

Would be much appreciated,

Kind regards,