Mobile responsive not working

I’ve read the forums and I think I may be stuffed, but some of the closed cases, did quite make sense to me. I am hosting a small page on a raspberry pi 2 at my home for some ham radio group stuff. I purchased a domain thru go daddy. My home internet is a dynamic IP so I use duckdns. when I use forward and masking (so my domain is seen after you land on the page) everything works, but on a mobile device like my android it is not responsive.

As long as as I used forward only everything works fine in terms of mobile responsive. I can live with it since this isn’t a business or anything juts just a local hobbyist group.

I’ve read something about iframes but I can’t really find anything that will fix the problem and fit into the requirements of my setup.