1. google unit only will resized base on first screen size. so if you using desktop site, and try to make it smaller, you won’t see those ads being resized. also may i know which ads you mention? i don’t see any problem with it in your website.
2. its because your menu is way too long. some people also having this problem, take a look right here : http://support.jegtheme.com/forums/topic/search-button-invinsible/