Hi, I see the issue (only on a phone) but it’s tough to say what the cause might be. The issue in the FAQ occurs only when the map container is initially hidden.
Could you try switching to the standard twentyeleven theme for starters, to see there’s a conflict? I’d suggest deactivating ALL plugins as well, in case there’s a javascript error from another plugin.
If that doesn’t work, is it possible to enable the mobile theme on a test page, so I can trace it in a normal web browser (it’s tougher to debug from the phone).