There is nothing really style specific to Apex that would cause that really, can you send me a link to the site with a test account possibly? Wondering if the ad behind the menu may be an issue but as far as I remember Apex is basically default except some padding on the menu links.
OK.. next question I have.. on my tablet (with both the default parent and my child style, the forum node list is a "little" funky. The spacing is what is weird. This is with an iPad mini using Chrome.
It's because of the node descriptions. No way to really detect the height and most of the time I do display: none for those if people are using dual column. Just not easy way around it and I should add that the style by default.