.hover going mad! Any idea why?

I’ve added a ‘hide/show’ to some buttons and they work great until I roll over them then they go mad. I’ve set it so that when you roll over the ‘tab’ div the buttons show but as soon as you roll over either the ‘right_arrow’ or ‘left_arrow’ they start to repeat the function over about 10 times before they stop - how do I stop that?

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I added everything inside another div and now it works