I checked your stie on my Android Mobile phone and I am seeing the menu on my end as seen below:
Can you please confirm if the issue has been resolved here already? Otherwise, to better picture what you are referring to here, can you please share with us a clear screenshot of what you see on your end so that we could address you more effectively?
If you don’t already have a screenshot service installed, you can try https://snipboard.io or http://skitch.com/. You can share the direct link to the image as a response to this topic.
Additionally, I’d like to understand your site properly, please share your System Status Report that you can find via WooCommerce > Status. Select Get system report and then Copy for support. Once you’ve done that, you can paste it into your reply here.
If you could also provide the fatal error logs (if any) under WooCommerce > Status > Logs.