Logged In Users fulfilling with same name

ZCM 11.3.2. Windows 7 SP1. I've seen this before, but can't recall solution, if any. On one of devices I see in ZCC Logged In Users section keep fulfilling with same name ... already 9-th in row. There should be usually appear one name at the time or nothing at all. Something not ok. Probably nothing serious, but it worries me. =)
Any ideas?
More thanks, Alar.