Yeah, there's lot of idiosyncrasies with Siri. I still haven't figured out even the simplest things, e.g. in my main bedroom I have a ceiling light, and a bedside lamp. If I tell Siri to turn on the main bedroom, light, she turns on both the ceiling light and the lamp. If I tell Siri to turn on the main bedroom ceiling light, - all is well.
In my kitchen, though, I have the ceiling light, under-cabinet lights, and bar lights. If I say to Siri to turn on the Kitchen ceiling light, she turns on all those lights. If I just ask her to turn on the kitchen light, she just turns on the kitchen ceiling light. Eh?!
None of this makes sense, but you just learn to navigate around the Siri nonsense.