Two linux desktops with different sync symbol

Hello community!
I don’t get the following: I have one linux laptop with the sync client and when ready with syncing, it shows the green circle icon with a white checkmark. The second linux laptop I synced with connects and syncs without any problems, but it has a grey cloud icon.

I don’t get what that means or why it is shown, since the synchronization works without any problems. Both laptops use version 2.6,2git. See the screenshot: