FortiAnalyzer shows chinese unauthencicated user in logs

[Arkadiusz I]

Hello
We are using Fortinet devices along with FortiGate + fortianalyzer service to check the logs. We managed to install zabbix in our test enviroment and connect the Agent (tested both on 6.0 and 5.0)
Server: Zabbix 6.2 on Ubuntu
Agent: Zabbix 6.2 Agent on Windows Server 2019
In fortianalyzer we see:

All locales on all servers are set to either PL or EN. We do not use any chinese.

Does anyone faced the same issue?
How can we fix it to EN or what this kind of user is?

This particular log shows communication via SMB service.

[Glencoe]

In some firewall logs you see some user accessing some smb service. What makes you think this is related to Zabbix?