Can you clarify your host licensing? Remember that Windows Server Datacenter (at least as of 2012 R2) is the only edition that allows for unlimited guests. Win Server Enterprise allows for only four free guests per host, and Win Server Standard allows for only *one* free guest per host.
But most importantly, which license keys are you using on your guests? You should make sure that if you are indeed trying to take advantage of the appropriate free hyper-v guest licensing, that you license each guest with the appropriate AVMA license keys:
https://technet.microsoft.com/en-us/library/dn303421(v=ws.11).aspx
My *guess* is that lansweeper will not count AVMA keys the same way it counts regular MAK/KMS keys.