Bug with Teambuilder

When you change your masteries while in teambuilder they don't necessarily change their name.

What I did to create the bug was I created a new mastery page and then deleted the previous page, but when I checked over the drop down list of mastery picks it showed me the name of old page and not the new page, however, scrolling over, or picking the page, revealed the name of the new page, so the bug seems to be graphical with no impact on the game.