Possible Bug with colonize same atmosphere?

[dmm]

That's not a bug. That's a feature that you enabled when you checked "Only colonize own atmosphere." You should have not checked it, which would have allowed you to colonize the wrong atmosphere but only using domes (which restricts colony size by a factor of 6). Then you could have used captured pops to get rid of domes or to colonize without domes, as you intended. There is currently no setup choice that causes disabling of domes but allows colonizing with captured pops. Sorry.