windows 8.1 - Computer waking up from sleep by itself

My PC, running Windows 8.1, is waking up from sleep by itself.

I have wake-up timers disabled:

And there should be no hardware that is allowed to wake my device:

In the second picture, we do see TeamViewer having scheduled a wake-up timer, but since those are disabled, this shouldn't be the problem, right?

I have BitDefender installed and I noticed it was scanning after the system woke. This isn't every time though, and I've had BitDefender for about 1.5 years now, while the unsolicited wake-up problem is pretty new.

Update: A suggestion in the answers was running Keith Hill's PowerShell script to analyze the PC's sleep behavior. The result can be seen below. The marked line was a test, letting it wake up by itself. Source: 0

What causes this computer to wake up?

Answer

The problem was teamviewer after all. I still can't figure out why though. Wakeup timers were disabled in my powersettings. I also contacted teamviewer about the issue since, after some googling, this seems to be an old problem.

The ensured me this issue has been fixed a while ago. Well it's clearly still there or it re-emerged..

Anyways, CASE CLOSED, if you got a similar issue, use the powercfg tool to find the culprit! In my case teamviewer.