Board Thread:Questions and Answers/@comment-26117975-20150512233930/@comment-174.35.1.80-20150705001304

Never use the Back or Forward buttons during any submissions. In this case it sounds to me that you hit "Back" after filling in the information that can be used to submit (to be charged). I personally never tested it because I am aware of it (I work closely with networking), but the information on that page could've been submitted because it needs to reload the page.

It is much safer to actually close the page rather then using the back/forward keys.