The article explains the meaning of the message:

Jun 05 01:35:47 router ntpd[11079]: receive: Unexpected origin timestamp 0xebeb6fa0.36eea7ae does not match aorg 0000000000.00000000 from server@xx.xx.xx.xx xmt 0xebeb72f3.55932e20

Jun 05 01:35:47 router ntpd[11079]: 5 Jun 01:35:47 ntpd[11079]: receive: Unexpected origin timestamp 0xebeb6fa0.36eea7ae does not match aorg 0000000000.00000000 from server@xx.xx.xx.xx xmt 0xebeb72f3.55932e20

messages from the NTP domain can be noticed.

Time drift in the router can be observed.

Synchronization failures between NTP server and client can be observed.

The client is reporting the log message, so something happened on the server.

The server can be found in the log message at [email protected]