Snap Areas appearing without window moving.

Describe the bug
The SnapAreas appearing quite often without „moving“ a window. Unfortunately I’m not able to reconstruct the bug, so I’ve no clue which behaviour leads to this bug.

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):
It could be related to a second monitor, but I'm not sure. Sidenote: I also bind the SnapAreas on my mousekeys.

Here is a Video:

Device information:

  • Type of Mac: iMac (Retina 5K, 27-inch, 2017)
  • macOS version: 10.14.3
  • BetterTouchTool version: 2.717