Well, the reason the investigators were able to get into the party was because there was a massive system failure (either caused by Daneel or by Acantha's rebel friends) that screwed up so many records and is making inter-station communication difficult.

Mythics are created on the other two stations! But they're usually transported over to Eurasia for the final delivery because it's got the quickest/easiest path down to Home due to its orbit. During the system failure, a bunch of Mythics and Mythics-to-be disappeared from Oceana. The consensus among the producers is that they got sent down somehow.

Given that the designer on Oceana views themself as an avant garde artist and is known for trying to push the envelope (and then sabotaging out of spite if their work is insulted), the producers aren't too surprised that some... odd Mythics showed up. Usually they 'fix' the experiments (and the spite sabotaging that they catch) that are deemed unsuitable for the show (and keep records, because the designer is something of a creative genius and there's always future money in that sometime down the line) right before they're sent down.

So, basically it's a whole big mess, and Yuri is probably feeling very stressed. Right now she's willing to blame Daneel and Jayden for almost everything (and means to get in contact with that artist once things are fixed to figure out what the hell they're up to now)