Robot population decline

[Tsavong]

I'm playing a machine empire which is an exterminator and just conquered some planets of another empire. That empire did have a lot of robot pops that are set to machine integration in my empire.
Now after the bio pops on those planets were purged I get a red warning about population decline on some of those planets and it shows those robots pops to decline with 5 a month. Hovering over the red warning says “overpopulation“, but the planets where that happens are mostly empty course I purged the bio pops.
My question : Why does that happen?

 

[MordridBlack]

because the ai don't know how to build planets

double check those worlds and make sure they have enough districts to house the robits

 

[Tsavong]

The planet has enough housing:

Spoiler: screenshots

 

[MordridBlack]

hm

next would be a check in your species tab to see if they are still integrating or if they changed to something else


in all honesty i don't see this kind of thing much as i rarely play "evil" empires

 

[Fenris_SE]

It's a bug. It only seems to happen to robot pops that you are not producing. You'll notice it sometimes if you take over a Fallen Empire and gain their robot pops as well.