Correct, this isn't supposed to happen at a terminal, and honestly tons of people hack schematics but we've
never seen anything like this
. It's literally impossible because the schematic retrieval and fabrication code aren't event connected to one another in any way in the code. So this is really baffling and there must be some other explanation. Like, those Swarmers came from somewhere else? I notice you're not standing right next to the terminal anymore, and they could've arrived through other means? When you closed the UI and hadn't moved at all, they had immediately appeared just then?
Actually notice that those Pests are purple instead of blue, which indicates you don't have direct control over them (and that they weren't fabricated). They are just allies that happen to be following you. Allies like that can come from other sources, like compromised ambush traps, and a few other possibilities. But normally that would be accompanied by a log message, and we don't see one here... so there seems to be more to this than the schematic hack.
Thanks for the report. This is weird. All we can do for now is see if it happens again. I just tried to repeat it by hacking tons of robot schematics all over the place, and (as expected) this was never the result. There must have been other factors involved.