"Normal Mouse" SHIFT Modifier not Working

Describe the bug

"Normal Mouse" shift modifier key isn't working. If I switch the modifier key to FN, then the gesture will work.

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):

Logitech G603 (Tried on both Bluetooth and with Dongle)

Device information:

  • Type of Mac: Macbook Pro 2017 15"
  • macOS version: 10.13.5
  • BetterTouchTool version: 850

Additional information (e.g. StackTraces, related issues, screenshots, workarounds, etc.):

Note: Before bug reporting, please make sure you have the latest version of BetterTouchTool and that you have already tried to restart your system :-). If you encounter a crash, please attach a crash log from the macOS Console.app from the "User Diagnostic Reports" section.