Disable Duplicate Connection not working?

[jitguy]

I have a remote access OpenVPN server set up with SSL/TLS and user auth. I also have the Duplicate Connection box unchecked. I access this connection either from my desktop or from my laptop. All works fine until I forget to disconnect from one device before using the other. I had read that this mode should disconnect the first device when I try to connect from the second. This (disconnecting the first client) either isn't happening, or the client is doing some auto-reconnect, because the new connection that I'm trying to use just keeps flapping up and down every few seconds. If I RDP into the first client and disconnect him, all is well.

Should OpenVPN simply disconnect the first client? That is what I would like.
If it is some auto-reconnect thing, how do I stop that?

I'm running the server on pfSense 2.4.5-p1. Clients are Windows 10 machines setup via Client Export.