PC twice in Network, how to remove?

hi folks I am installing my Synology DS 213J, and as part of that operation I need to make some alterations in my Network settings to get it working. Now, 'network' stuff is not my cup of tea, way too complicated.:confused: As a result, I found my PC-ADMIN twice in my network, I refer to the print screen. The are shown in a different way though. I'm not sure if that is necessary, so I...