Random connections/clients on your WebMonitor panel is typically the result of your WebMonitor client executable (.exe) being emulated by virtual machines belonging to online AV scanners.
It may also be the result of your AV (i.e. BitDefender) automatically scanning it in the background and distributing it for further analysis where could be emulated by various of virtual machines.
Usually, those virtual machines will emulate your WebMonitor client executable (.exe) for a few seconds, but the connection will remain in your panel, marked as offline.
To remove those unwanted connections from your panel, simply right click in your connection table and perform “Clean connections”.
Note: This is a safe operation and will not affect your online connections.