A number of plugins (for example Visual Compose for Wordpress) have tried to use are causing throwing Paglelines Admin tabs out of position. This is because you are not defining all CSS properties in the tabs (on pages / posts). As such can you please add some CSS code like the following to resolve the conflicts:-
I beleive that #tabsnav li a, #tabsnav li is a commonly used CSS in plugins.
I'm sure you'll want to tweak my CSS to get it exactly how you would like.