Gaps in images – k2

I was prepared for this, but this problem is blowing my mind. Hopefully some kind soul can see the obvious error I’m having here.

Anyways here’s the problem: https://img42.imageshack.us/img42/6457/31118244.jpg

It’s an extra 4 pixels … since there should be only a 2 pixel gap between the images

Ever since I upgraded K2 …(reluctantly) I for the life of me can’t find the CSS code or whatever to get rid of this.

site: https://rednights.net/typenights

Thanks for anyone that can help me out =)