I recently tried exporting some caches through the virtual GPX function. I had exported some the day before and there was a count of 8700 or so. The new group was around 2500. This failed as expected.
However the next time I went to do an export, the count was shown as below.
You can export 10000 geocaches per 24 hour interval as GPX or CSV. You have exported 11541 the last 24 hours. Note that you can export the same geocaches more than once and that they still only count as one.
This suggests that it included the second attempt in the count even though those were not sent out.
It appears there is an overcounting of exports.