Delete this file & restart...
~/Library/LaunchAgents/com.elgato.StreamDeck.plist
~ tilde indicates your home folder
Apple hid the Users' Library folders...
Method 1:
1 From the Finder, select the Go menu at top of the screen, and choose Go to Folder.
2 In the window that opens, enter ~/Library, and click Go.
Restart, if that doesn't cure it...
On your Mac, choose Apple menu > Shut Down.
Wait for your Mac to shut down completely. A Mac is completely shut down when the screen is black and any lights (including in the Touch Bar) are off.
Press and hold the power button on your Mac until “Loading startup options” appears.
Select a volume.
Press and hold the Shift key, then click Continue in Safe Mode.
The computer restarts automatically. When the login window appears, you should see “Safe Boot” in the menu bar.
Does the problem occur in SafeMode?