Tvheadend

I have been using Tvheadend for a number of years. What a great product, congratulations to all involved.
My only issue is the Web UI and scrolling when using a tablet. I use the UI to schedule recordings etc but on a tablet, either Android or iOS, the guide cannot be scrolled. Scroll bars do not appear. When I use a PC there is no problem. Scroll bars appear and the page can be scrolled. Thus revealing many more days of the guide.
I have been updating as versions have been released but so far this has not changed.

Can anyone tell me why? Is there some setting that I am missing?