homepod in room next door answering

I have HomePod/minis in my bedroom, home office and living room. Recently, whenever I’ve tried to ask Siri to do something anywhere in the house, my office HomePod picks up the request. This is very frustrating when I’m trying to do something room-specific (like turn the TV off, or set an alarm), and has only just started happening in the last month or so. Is there a way to fix this problem?