I recently ran into an issue where the system sold 13 out of 12 tickets. It looks like the last two registrants had registered about 3 minutes apart and the Authorize.Net timestamp was about 1 minute apart.
In version 4.9.23+ we added a reservation system that reserves tickets when the user first starts a registration on an event, each of the registration steps then checks the count which should prevent the above from happening.
As your currently running 4.9.0.p I’d recommend updating to the latest version of EE (currently 4.9.42.p).
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