volume slider bug?

Describe the bug
when I use volume slider bar, The adjustment is possible, but the adjustment screen is not displayed like the image.

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

Screenshots

Device information:

  • Type of Mac: 2018 MBP
  • macOS version: 10.14
  • BetterTouchTool version: 2.645

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.