Master slide layer appearing when revisiting slide

I have a menu bar system based in the master slide layers, basically it works like below:

Base layer - menu button (click to show layer 1)

Layer 1 - menu bar flies in (you have the ability to navigate to different slides from here) (click menu again to show layer 2)

Layer 2 - changes the state of all objects on layer to hidden when timeline starts. (menu bar flies away)

This works perfectly, however, say you are on slide 10, then bring up the menu bar and go to slide 9. When you advance to slide 10 again, the menu bar pops up automatically.

Does anyone know why this would be happening?

Thanks

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