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Depending on the tracking system for the web site, it's possible that multiple views of the receipt page will generate multiple "orders" in the web stats.
Anything else that we might be missing here?
joined:Mar 8, 2002
Agreed, multiple views of the success page can cause overtracking of conversions. This is the problem with depending on pixel-based tracking.
We see this on one of our sites, but never thought to fix it. The user is given a password on the page, so they seem to use the page as a memory chip for the password.
For starters, in case it's the slow-load problem, compare your count of tag hits to the count of ack page view (or, better yet, ack page VISITS which will pretty much avoid the double-viewing issue). If the two methods agree, then the problem isn't likely to be related to clicking away before the tag loads. But it still could have to do with people not seeing the ack page, for some reason.