I’ve been having this issue with sticky and unresponsive tab behavior lately. Only happens when physically clicking back and forth between tabs, not taping on them in the same fashion. Tabs will stick, won’t close, or will create weird spaces in the bar. Sometimes will stick to the cursor but that is hard to reproduce.
Not sure if Bettertouchtool is to blame, harder to reproduce with it disabled but is has happened with it disabled.
Running TotalFinder 1.10.0 but have experienced it with previous versions.
MacBook Pro 2017, 10.12.6 Sierra
Video of behavior: