Why does the col-sm-3 mesh move out?

Question

css

There is a layout made from col-sm-3, the bottom line always moves to the right, that is, the distance between the blocks disappears. The bottom line always moves out regardless of the number of blocks. I'm attaching a screenshot.

Answer 1

xs but pay attention that the top div is different, it has only 3 lines of text.
Will there be a problem if all the divs have the same content?

Answer 2

and the height of the blocks is static or according to the content? try to set for example 300px, it was like that, it was decided just the same static height of the block with content