Spreadplayers spreading 2 entitys to same location

I'm currently using this cmd: "/spreadplayers 6 -1878 1 17 false @e[type=Squid,r=8]" and it spreads squids on to 1x1 platforms that are in a grid above lava and sometimes it will spread 2 squids on the same platform.

EDIT: Also happens when not above lava, when just having the command blocks.