It's a known bug. I'd suggest using [masteries=MASTERY URL HERE] instead to show the full tree. Use the mastery tree planner to get your URL.

Thanks to The_Nameless_Bard for the sig!
EDIT: absolutely nothing, in the early days of the new masteries the &=v2 section would glitch out the coding so those of us updating our guides quickly found out what was up and how to fix it. But now the sight coding is fixed so it is no longer an issue. the problem persisted long enough for some of us, myself included, to make dropping that bit of the URL a habit
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Am I doing something wrong?