cut/paste, move, leaves 0kb files.

From the web app, when I cut and paste files or drag and drop, it will copy the file and leave behind a 0kb file in the original location that must be manually deleted. Please help.

What's the web browser are you using? Device model of your Android? Android version? You're using the universal shortcuts of cut/copy/paste, or cut/copy/paste on web.airdroid.com? This happens to all file formats?