Snapping to the right snaps to the left

Describe the bug
Snapping a window to the right snaps it to the left instead. Trying a second time does the trick. Snapping to the left is fine.

Happens regardless of snapping method - dragging, keyboard shortcut, etc.,

Screenshots
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Device information:

  • Type of Mac: Pro early 2015
  • macOS version: Big Sur 11.0.1
  • BetterTouchTool version: 3.504 (1642)

Additional information (e.g. StackTraces, related issues, screenshots, workarounds, etc.):
Happens on all apps.
This only happens on my big main monitor. It is placed to the left of the Mac monitor, and I'm using both screens as a single space (e.g. Macbook monitor does not have its own menu bar). Snapping on Mac monitors works perfectly.