Which version of Tableau Server are you using?
Is this unexpected behavior present in each of the popular browsers? Or, does it display correctly in IE with unexpected behavior in one or more of the other popular browsers?
If behavior varies across browsers, please list the browsers and versions that show the unexpected behavior.
If you can do a screen shot or two and post these to the thread, that'd help, too. :-)
I am using Tableau server version 8.1.0. (my tableau desktop version is 8.1.0).