Gallery File Auto-Download on page visit

can you check if there was a widget named "Media Gallery - Download File" is placed on the media gallery post page.

if this widget is placed you cant even go to the page to edit it , it would auto downloads the file.

You can simply hide the widget with  $core_v2_widget.Hide()  and see the behavior 

I've experienced that the media gallery will auto-download the file only where it previews the file. I suspect by auto download the file you're meaning that it tells the browser to download it to the computer, though in my experience here I'm meaning that it will count as a download if it shows a preview of the media gallery item (this occurs with pdfs and images).

Though it could be that whatever's being used to preview the file may be causing this misbehaviour on your Community too.