DDM, two instances running on startup

After updating DDM (Dell Display Manager) recently, I noticed that in the list of my startup programs that ddm.exe is set to run twice, though with different keys:  Startup User and Startup Common. Both startup entries point to the exact same file. Are both ddm.exe startups necessary, and if not, which entry is the best to retain (Startup or Common) ? 

I do use dual displays. I am the administrator. No other users exist on the system.