Teamviewer shows shut down PC to be online

PC is shut down but Teamviewer still shows it to be online.
Hi, using two PC in different floors. Each PC has got Win7, Win81 and Win10 on different partitions. I'm using WakeOnLan on both of them. When Win81 or Win10 is shut down the PC is shown offline - that's o.k.. But if I shut down the Win7 system - it's really down and off -  but still shown in Teamviewer on the second PC to be alive. But if I try to connect Teamviewer tells "not connected". So I'd like to get it to be shown "offline" if it's offline. Any suggestion, please?
Denker53 / Peter