FOP question/issue

Does anyone know why the FOP would display differently whether called from the:

Trixbox menu (http://[boxname]/user/index.php?fop)

and from

FreePBX (http://[boxname]/admin/panel.php).

When called from the Trixbox menu it displays perfectly, when called from FreePBX it is stretched out and some of the labels disappear.

I could probably work it out but is this a known issue? It has always done this even from the early (2.2.x) versions.