Hard to tell with that amount of data... Let's see... When the domain controller received these Kerberos ticket requests, the ATA gateway (or light gateway) was not able to resolve the IP into an entity. It tried Reverse DNS, NetBIOS and NTLM over RPC and had no luck. So it stored those activities into a the profile of the Unresolved entity.
You might have the same IP used somewhere else at a different time. And for these communication, the gateway was able to do the resolution.
You can see the logs of the resolution attempts in the logs. See the following documentation to locate the Microsoft.Tri.Gateway-Resolution.log file.