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Responsive grid (Some of the Groups in the Repeating group are overlapping each other/they overlap even borders, having different vertical size. How to make them to have a fixed height?)

Could you please help me:

Some of the Groups in the Repeating group are overlapping each other/they overlap even borders, having different vertical size. How to make them to have a fixed height?

The second question: How to make the header fixed on the top. I`m trying to find the option how to fix it but I do not know where.


Thank you!