avast password the copy button can not copy password

I am using the latest version of avast prime, when i user the password function(not in the browser), i found that when i choose a password i have stored, and click the copy button, avast tell me the password have be copied, but when i ctrl+v and right click my mouse, i found that nothing is copied. I must to click the “view password” button and see the password in plant text, then select the password and ctrl+c,or enter to the edit window to select the password and ctrl+c to copy my password(the copy button in edit window is not functional to). please tell me whether it is a bug or something need set to my computer?