Mpiedra,
I have the same problem but the meta in the header is already what you said to change.
<meta name=”viewport” content=”width=device-width, initial-scale=1.0″>
This problem is mostly on the Android phone and tablet. iPhone renders it ok.
This is the site with problems on the mobile devices.
https://hallelujahgirl.com/wp/
Thanks,
LeonardoWK