Alignment cracks - make layout consistent for Pinbin theme

Hi there and thanks for this lovely theme.

I use Pinbin on my site and, sometimes, as I turn the site’s pages (Next or Previous) on my PC, the alignment of the posts cracks and the second row is formed in a straight line under the lowest post that was aligned correctly.
So, what I get is a page with the top 5 post in the top row, a 6th post aligned correctly under the far right post and 4 posts at the bottom of the page.

Any ideas?
Thanks in advance,

Hi Elias,

I hope you are well today and sorry for the delay here.

Do you still need assistance regarding this question?

Please advise.

Kind Regards,