I’ve had this same inconsistency issue happen too about a week ago, with Building Props. I haven’t run into it with devices but I haven’t placed any devices recently. I’ve been having problems with Building Props breaking my project (project crashes when I enter Live Edit after adding a prop) and I was wondering if this was related. But it sounds like for you it doesn’t have to do with Building Props.
I posted about it here, in a reply to my post about my broken project. Blocker - Can't test game for the past 3 days - Content Beacon and Infinite Downloading - #14
The inconsistency itself might not be game breaking but if it’s related to larger problems, that’s worrying. Currently it’s been almost two weeks since this issue started for me and as far as I know, Live Edit crashes every time I place a Building Prop. I haven’t tried adding a Building Prop in a bit because I need to work on my project and I can’t afford to continue to break it.