Your settings look fine. Murmur should not knock another user offline and I do not know why it is doing that.
Did you make a back-up of your microSD card?
If so, this would be a good time to test with it to see if you have the same issue.
73 - Mark - K8MHW
'A RigPi Enthusiast!' - I am not otherwise affiliated with MFJ or RigPi