Visual anomaly while trying a code weight with global variable

I am trying to learn JavaScript using Tumult Hype. Yes, ok...I finally made up my mind which, for me, is a big step forward.
In trying and retrying various solutions, I ran into this problem. Basically, the buttons move on their own, without me giving any instruction to do so.
The problem falls on both Safari and Chrome....
Help!

Video: http://www.powerkids.it/video/anomalia.mp4

Probably best for you to post the project file.
But i am wondering if you have any actions and timelines on them? (On hover)

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You say right! I wrong and assign a on hover instruction without that I know it!
Thank you for help!

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