Hey,
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I am not sure what do you mean, can you share me your webiste url and screenshots?
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Marquee requires fixed height in order to be visible, since it is based on absolute positioning, set height to height of the highest card.
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You can access backups if you have recently published a version with that component.
So in new tab open your builder as /builder?backup=1
You can use any number, backup=1 is most recent update, and then the higher number is, the oldest version is.
Just keep in mind, when you are viewing backup, do not change anything there or publish, just use it so you can copy JSON from backup, so you can paste it on your regular version.
Here you can learn how to copy JSON and Paste it between sites, in your case between backup version and live version: