~syncthing~ attached to file name

I have several synchronised files that now have the blue symbol and have ~syncthing~ at the beginning of the file name and have a second file ext namely .tmp

No matter what I have tried it still remains. The original file is also in place with the blue symbol.

Advice please.

Creepy proprietary syncing system from WD.

It might be, but doesn’t help me get rid of them and complete syncronisation. I have made back ups of the original an the extra files then deleted the extra files only to find next time I look they are back