Try with this meta
But from the issue You described, I think that you have some css conflict.
Btw I have seen that you use bootstrap framework.
I had fight with this framework a week ago and i had to make some major changes because of a few project issues. I want to say that its possible you overwright some bootstrap styles or there is some bootstrap malfunctioning in your case . Anyway, my opinion is that bootstrap is not the best choice when you are building responsive site. You may try with skeleton, (I think its better). Cheers !