I have noticed that on multiple occasions the masonry layout is broken with the horizontal padding not applying at all and being 0.
This happens whether the elements in the grid are blocks or images etc.
I can’t replicate the issue with the missing horizontal gap. Can you screenshot the masonry settings, or even better, if you can copy-paste the relevant section here?
I have replicated on a site where only Bricks is installed to see if the issue is caused by another plugin. Issue seems to appear when you make each block html tag li. You can clearly see the behaviour with blocks instead of an image gallery, as you can change the tag from div to li:
And it might be caused by ACSS.
The issue is only when an li tag is applied (this can be blocks as above or an image gallery) but only happens when ACSS is turned on:
Can you also share the link to this installation? Based on the styles, we could probably see what is going on, as we are unable to reproduce the problem.
But this site is using ACSS as well, so the issue is still related to the margin-block: 0, overriding the margin bottom to apply the gap vertically, and the solution is still this: