Run Mobile Safari in the iOS Simulator, enable remote Javascript debugging (search for the little shell script to enable it), navigate to localhost:9999 from any browser, and you have a full Web Inspector.
Post the relevant CSS and <head> contents. Without these, it's a waste of time for anybody to try to help you. Always post <head> since more than half the problems reported here can be solved with correct <head> contents.
It sounds, though, like it might be a viewport issue.