I have set my adapter firewall to Trusted and it keeps changing to Home/Office when I start my computer. Also the BD firewall shows a second adapter with Public setup, and when I change back my 1st adapter to Trusted the second adapter disappears. 
Thought, I don't know if there´s a pattern between starting the computer and this firewall adapter awkward behavior, but looks like it. 
----------------------------------------------------------
Windows 10 Pro (Final) - Build 10240
Bitdefender Internet Security 2016 - Build 20.0.18.1037