looks like you are using jarida, great theme, from my experience it just doesn’t look good on mobile, one thing I noticed was your main site is showing desktop and forums is showing mobile view on my galaxy s5, not sure if you have it set up like that or it’s a caching issue, the best way I have found to use adsense for mobile with the forum, is to not use responsive ads, you never know what’s going to be served, a huge 300×250 ad just doesn’t look good in the header on a mobile view imo.
your only option is probably going to be to specify a smaller mobile ad for the unified theme, with Jarida, it is going have to be relatively small because of how narrow the theme is on mobile and tablet view
you can look through my user ID on tielabs support forums to see all the issues I had with jarida,
http://support.tielabs.com/forums/users/kvr28
there is a lot of tweaking needed with it to tie in well with SP, another one I can point out to you is a zindex issue with the log in on mobile, you can see the same on your forum
responsive video display is another big issue with Jarida on the forum, it took me awhile to get that figured out
This is not a knock on Jarida, it’s has a lot of positives and we used them for a long time, it just doesn’t tie in well with forum and mobile displays, I had to add a lot of custom css to make the forum look good
that’s what I have found with themes, they either look great on the blog side and look horrible with the forum, or vice versa, very few do both really well
we ended up going with newsmag, it looks great on mobile, tablet, and desktop and the forum fits and looks perfect, you can see it here if you want on mobile, I don’t have ads enabled on it right now, I was a bad forum admin and didn’t listen to MP and Yellow and create a custom version of unified, so I lost my ads when it updated, just haven’t gotten back around to putting them back, after I create a custom theme of course 
http://thehomesteadingboards.com/forums/
if you decide to stick with Jarida, let me know and I’ll fire it up on my staging server and pull all my custom css off it to give you a good direction to go in as far as modifying to look better
sorry for the ramble, just wanted to give my 2 cents