A couple of strange things:
First, the url you posted is forwarding to: https://www.client.wallendorfstudio.com/#menu
Secondly, the following errors are being thrown to the console:
Font from origin 'https://f53.e51.myftpupload.com' has been blocked from loading by Cross-Origin Resource Sharing policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://www.client.wallendorfstudio.com' is therefore not allowed access.
jquery.js?ver=1.12.4:2 Uncaught Error: Syntax error, unrecognized expression: #menu!loading
Now for some useful info. It seems you are wrapping the triggers in p tags to center them.
It seems that mobile devices are not allowing the javascript actions to bubble up to the p tags.
How are you creating the triggers? can you post an example of the exact code you are using? Also, how did you remove the arrows? It seems you have made changes to the CSS.
Here is a test: Try removing one p tag wrapper and see if that works (you will loose centering).
