White line appearing when using two fingers on touch bar

Describe the bug
When placing two fingers on the touch bar and moving them while the BTT section is active, all buttons will disappear and a white line will appear over where the buttons would be

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

If applicable, add screenshots to help explain your problem. (You can just paste or drag them here)

Device information:

  • Type of Mac: MacBook Pro 2017
  • macOS version: 10.13.4
  • BetterTouchTool version: 2.503 (841)

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.

that's to indicate that you are doing a BetterTouchTool touch bar gesture. You can add them in the BetterTouchTool Touchbar tab, just like widgets or buttons.