I don't own a regular iPad, so I can't tell how it looks there, but in my iPad mini the Forums' drop-down menu is aligned all the way to the left. You actually can only see the end of it on the left of the screen.
Yeah... it's a known issue where the width of the menu is greater than the width of the browser window. I believe it's fixed in XenForo 1.2 (which we have not upgraded to yet).
I was almost certain someone already told you about that, but thought I'd let you know anyway, just in case. Another thing that I wanted to point out is sometimes when I create a thread or submit a reply and then if I immediately go back to edit it, it seems like the new line function isn't working right away. For instance, if I go back to editing and want to create a paragraph by hitting the enter button, it doesn't show that a new line is being created. However, if I save the edited post, it show that the new line (paragraph) is there. If I open it to edit again the new line will be there. Some kind of sluggishness in the markdown function, I think.
XenForo 1.2 changes the editor it uses from TinyMCE to something much better (Redactor), so hopefully that is inherently fixed in 1.2 as well.