I've seen incorrect hostnames in Environment Manager (EV) when machines get cloned from one to another. You can try the following procedure to correct the situation:
1. Stop the EV Agent service/process (hq-agent.sh stop -or- hq-agent.bat stop)
2. Once the agent is completely stopped, delete the agent data directory (…/SASEnvironmentManager/agent.5.8.0-ee/data)
2. Delete the Platform host resource (Grid2) in EV
3. Restart the EV Agent service/process which should rediscover the correctly named host resource (Grid1)
If this doesn't fix the problem, I would recommend opening up a track with Technical Support.