Regarding your note about feedback on this in the changelog - I've had this twice now and both times it has happened when there has been a wolf spider wave.

More specifically, I'm not 100% but I think a wolf spider is getting stuck in a wall and the ants are trying to attack it. I can't be sure because I've not seen the spider moving in or out of the wall but I've been pretty sure I cleared the wave in full then later noticed another spider near where the 'bugged' ants were gathering.

Are your ants moving to the right? 

This occurs when ants try to go to the surface, but for some reason their pathing fails, and resorts to getting as close as possible to where the surface physically is within the game (which is not underneath the surface). 
And on the sixth day, God created ant in his own image, and gave them dominion over the earth and all of its creatures.  Amen.

  • Mike

  • Colony
  • *
    Global Moderator
    Community Manager
Thanks for the report - we're trying to get to the bottom of this one.