Secret Server Integration

Hello, I have recently integrated RDM with my company's Secret Server deployment, but I'm a bit confused about the credential selection list.

On a Remote Desktop session, I have chosen to use "Existing credential entry" and then selected the credential entry for our Secret Server. Then I click the link underneath the drop down box that says "Select from list". This brings me to the tree where I select the appropriate credential from within Secret Server. This is fine, but when I go to open that session, I am once again prompted to select my credential from the list. If I hit cancel, the dialog box goes away and I am logged in with the credential I selected when editing my RDP session.

I'm curious as to why I am getting prompted to select the credential again. Why give the option to select it when modifying a session if I will simply be prompted to select it once again? Am I missing something somewhere?