How do we purge/remove the duplicated vias in the same location of the PCB editor? These vias are not the one stacked and they are just blind vias running in internal layers 12-14. I find there is an additional copy of the blind via at the same location. Not sure what caused this issue.
A Database Check may/may not remove these but worth a try. If not turn on the duplicate drill holes DRC (Setup - Constraints - Modes then General) which will show a DRC where they are.
This happens all the time to people who translate to Allegro to delay confronting management over the inevitable: floating PADS out to the middle of a pond and setting fire to it.