Curious incident on server

Hey guys. Wondering if anyone has any input on a strange issue I saw in RustIO and Rcon tools etc. I had a player logging into his character yet having two separate names and also somehow logging in via both windows and OSX within 3 seconds of each log out/in. Is this suspicious behaviour or just strange behavior. Because it doesn't sit right with me haha

 

Thanks for the response, I'll keep an eye on that particular player for anything unusual. Or if he knows English I'll just ask him