Shove Vole Prefairing going left?

[Miravlix]

I have a row of windows that I keep drills above to crush regolith, so I also made it the location I release shove voles.

 

The problem is that all the voles is ending up on the left most of the tiles. I have the critter drop of on the right most tile and the grooming station next to it, but all the voles has run off and is all standing on the 17ish left tile of the window. (The window is 2/3 of the length of the possible with of an asteroid)

 

Okay, this is just weird, I didn't need window tiles at the last few tiles on the left and had used insulated tile, currently testing converting them to window tiles and it seems like the voles is now less attracted to the left, but I need many more cycles before it's clear.