Player shifting on slide layer

I have a slide with multiple layers that I built in SL3. On one layer the whole slide seems to shift up to the point where I can't see the title and the markers at the top. Looking at the layers, it looks the same as all the others, so I don't understand why it's doing that. I have attached the story file here. The layer that is shifting is when you click 'Diptongos' or any of the subsequent layers that reveal when clicking the buttons underneath. Thanks so much!

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