Why do I need to press C twice to copy in Mac MS Word 2011 and 2016?
Please loot at this:
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_word-mso_mac/often-have-to-cmd-c-twice-to-copy-mac-office/0a3060eb-d185-46df-943d-3ed89f447d25?auth=1

When I disabled the three fingers drag, the problem have solved.