Strange Clipboard behaviour on OS X El Capitan
HO! Just moments ago,   four different copies appeared in various software on my macbook


AAA: Clipboard
BBB: SecureCRT   iTerm   Evernote  
CCC: Chrome
DDD: Sublime


I have two solutions.


Open the Terminal application（found in /Applications/Utilities/），Type the command  killall pboard ， Hit Return(Recommend)；
copy different text and paste it；


But I still don't know why....

macOS 10.13.6 (17G65)