I have been trying to figure this out ever since, but if you go to my website, and scroll down, you can see that there are some gaps in the posts which is not normal and they should be filled up with posts. 

Also, if you resize the browser on desktop, or view the site from a mobile, the first few posts overlap each other.

Does anybody know what is wrong? I.E what code is overlapping what please?

I am using the Pinboard theme, but with mods, on Wordpress.

Thanks in advance!