MMS is assigning same alias to two data nodes of different shards and replicasets
From the MMS Dashboard; what is the MMS Agent Log saying?



Have you looked in the mms-monitoring agent log locally on the server?

/var/log/mongodb-mms/monitoring-agent.log

Update

Please add a screen shot of how you are configuring the host



Update 14:02

Can you ping S143, S144 and mongo-client2 from the server where the mms-agent is installed? 

Can you telnet to those servers from the mms-agent machine?

ex

telnet S143 37007
telnet S144 37007
telnet mongo-client2 37007


If you can't, then perhaps there is a network problem between the server with the MMS agent and the three mongods you listed above.