Added hover to the state and grouped my objects

I have a series of 4 stacked boxes and want to add a hover state to each. I was able to add hover to the first box and now I am unable to select the other 3 boxes, timeline does not acknowledge the other 3 boxes and I'm not able to adjust their state. I built the slide twice trying to fix the problem but it happened both times. What did I do wrong and how do I fix it?

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