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You selected the issue: Phantom Steam Controllers

If your computer goes to sleep with the Steam Controller plugged in, you may start seeing multiple Steam Controllers being detected even if you only own one.

Unplug the Steam Controller
Unplug your USB wireless dongle or micro USB cable, wait a moment, then plug it back in.
Restart the Steam client
  1. In the Steam client, click on the Steam dropdown
  2. Select Exit
  3. Re-launch Steam from your desktop