YSF2DMR not showing all the Masters

[M0GXB]

I am trying to configure YSF2DMR to work to a private server, the details of which have been added into the DMR GW list.
But the problem I have is that the DMR Master drop-down list does not show the "DMRGateway" option in the way that the DMR's configuration does.
So the only gateways I can select are ones I don't want it to use.

Is there a way to get round this or have I misunderstood how it works?

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