Q: Total Burdened Cost anomaly - multiplie TBC lines created on singlle Raw cost line

Please, has anyone experience with the following issue when running PRC: Distribute Total Burdened Cost:?

We are on R12.1.3 and at random some old (2007 and 2008) expenditure item lines are being re-burdened multiplle times with each run of PRC: Distribute Total Burdened Cost. The new burden lines are always reversals and reapplication of the previous burden dr. and cr. amounts, which results in a net-zero effect on GL burden journals - tothe extent that AutoAccounting rules have not changed.  The result is that some old raw cost lines have accumulted many (someitmes over a hundred) TBC distribution lines. There seems to  be no logic or consistency to the processes selection of raw cost lines. At present