Okay I've been trying to fix this bug for a while and just cannot figure out what is causing it. Basically in Metris there is a gap on the Y position when the blocks are drawn. It looks like this:
I messed with the script a lot and after months of tinkering still never figured it out. Here is the script (it is GS2) for anyone who wants to try:
I noticed the same glitch on Kingdoms, which means they are likely still using the GS1 version of the script. I will share this script with Sky when I talk to him again.