Not exactly a bug, but an imperfection. Apologies if it have been posted previously, I'm new to the forum.
I noticed that Quint, which serves as firetruck AND a platform falls under Firetruck category, and that only. Is not shown under Other Fire Apparatus TAB.
Also, when I added firetrucks and platforms to a certain Response Regulation, I noticed the game checks the Quint as the nearest firetruck, but also checks Platform as well, like the Quint wasn't enough! So there are Quint AND a Platform going to the scene. To prevent that we need to uncheck the Platform manually. It's the same with Rescue Engine and Heavy Rescue Vehicle.
My rig: Win 7, Firefox 57, I also play on Android app, but in this case I believe it does't matter Cheers guys, the game is great and me and my firefighter and 911/112-calltaker friends are having great time playing it
EDIT: Just a minute ago I noticed: Regulation I created says Firetruck, Platform, Heavy Rescue Vehicle, after selecting the regulation the vehicles checked are Firetruck, Platform and Heavy Rescue Engine. Guess you already were working on this, but it still needs some adjustment