Sometimes, when Agent reports to Zabbix Server first time, it did it with few, very quick probes:

58492:20170209:131038.642 cannot send list of active checks to "10.163.181.224": host [s-vmrh-esm-connector7] not found
58490:20170209:131038.679 cannot send list of active checks to "10.163.181.224": host [s-vmrh-esm-connector7] not found
58495:20170209:131038.723 cannot send list of active checks to "10.163.181.224": host [s-vmrh-esm-connector7] not found
58482:20170209:131038.750 cannot send list of active checks to "10.163.181.224": host [s-vmrh-esm-connector7] not found

I don't know why Agents do that.

Then, Zabbix Server registers 4 (or any other amount depends how many times Agent reports to) the same host, with the same HOST.HOST which is generally not possible.
The only action I can do is delete the duplicate hosts.
As you can see on attached screen this is abnormal situation.

Bests,
Grzegorz