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Buttom animation is after the third cklick different


i wanted to build a simple big menu which is dropping down when you use the menu button, which is also animated.

First click, works ok, dropping down
Second click , it is closing, disappearing.

Usually i was thinking it should work, but when you click again the button, the menu is not dropping down anymore, just appear like it disappear on the second click.

what i am missing?

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