Sync, duplicates, deleted files

Sorry for my English via Google Translator . But now I use foul language and get angry at you and your program .
I have 2 systems: Windows and Fedora. In both operating systems installed Insync. At first I did not know what Insync does not see that the files already in the folder and they do not need to synchronize . Secondly , it began to re- download all the files , creating duplicates . And thirdly IT WILL REMOVE ALMOST ALL OF THE ORIGINAL FILES!!!
In Russian this situation is called a “jobanyj pizdec”

Hi @LANstalker kindly send in your logs (How to find the log files)

and the link to this post to so we can address this immediately.