Easy example that happened moments ago. I read Patrick's post on the forum using my iPhone. Then clicked his username and went to his user page.
From there I select the navigation menu, select "forums", and try to select "posts" to view all his forum posts. Instead of registering my tap on "posts" it registers my tap as "wiki entries", which is behind the "forums" drop down menu and on the navigation menu.
I hope this was clear, I'm pretty tired