I setup a MongoDB replicaset.

At the beggining, due to limited hardware, I created three MongoDB instances in one server and different ports, then add the three instances into one replicaset.

Subsequently, I got an arbiter server, so I added the arbiter into the replicaset and then dropped one instance.

Lastly, I got another server which I configured as a normal MongoDB data instance, so I added it into the replicaset and dropped another instance sitting on the first server from the replicaset.

Now, I realise I have good replicaset config information in both data node, but not the arbiter server. The arbiter server is still showing the very first replicaset config in which members 3 instance in one same server.

I tried various ways to change the replicaset config information in the arbiter server but all in vain. How do I fix this?