Vt*: Duplicate Autogenerated Numbers when records are created
When there are concurrent webform submissions such as to Leads module, the system creates duplicate autogenerated numbers.
There is no specific way to re-produce this issue. We have faced this issue with many installations with busy landing pages. Especially when the webforms are opened in a mobile device.
This is due to the fact that there is no Table locking while incrementing the Seq numbers for the autogenerated fields. As such we have concurrent form submissions, multiple requests read the same value and hence ending into same autogenerated numbers.