Most likely you have missclicked the CoH2 Base Game in the DLC list in steam
The base game isn't even listed in the DLC list. And now I have two listings for WFA. Here is what I see:
•"COH2 - The Western Front Armies: Oberkommando West" (Installed)
•"COH2 - The Western Front Armies: US Forces" (Installed)
•"Company of Heroes 2 - Ardennes Assault" (Installed)
•"Company of Heroes 2 - Ardennes Assault: Fox Company Rangers" (Installed)
•"Company of Heroes 2 - The British Forces" (Installed)
•"Company of Heroes 2 - The Western Front Armies" (Installed)
•"Company of Heroes 2 - The Western Front Armies" (Installed)