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HELP: Div block disappearing after cursor hover

Hi there,

I am relatively new to Webflow so I am sorry if this is trivial:

I have a column with 3 Div Blocks and when I messed around with giving them effects when you hover. But now whenever I am in preview mode. As soon as I have over the first column div block it disappears!
I have tried to reset all setting for transitions/cursor on that column and dive block but still nothing. I have attached a screenshot below. Any help is appreciated.

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