Column height pushing other columns down


I'm a noob. I've done most of my work on Divi in the past, but WordPress doesn't fit my needs anymore, so I opted for Bootstrap Studio. if this is an obvious solution, please share.

To the point; my columns height is pushing the other columns down when I don't want their heights to be equal. I've tried a few things but can't figure it out, even recreated the same thing in Pinegrow and it has a similar issue, which leads me to believe it's a combination of my approach and Bootstrap itself. Perhaps it's flexbox, as I believe it only works horizontally and not vertically. I would love to use CSS Grid, but I don't think BSS has options for it, at least not like Pinegrow.

This is what is happening

this is what I want to happen

Much appreciated!