Opening a pdf file duplicates it on android Whenever I open a pdf file in adobe reader in Android and then close it, the pdf file duplicates itself in the same folder. This happens again and again as I open and close the file.

I tried searching google but found nothing relevant.
I would try to go to the pdf reader app settings and clean the data.
Settings -> apps -> the pdf app -> clear data 
This will reset the app.
Is this happening to different pds files or just one? Is the file located on the phone or on the internet?