Erroneous records inserted in Promotion_data

Guys,

Thanks in advance for helping me out on this situation.

we are live on 7.2 and have come across a weird situation. When we load promotions through Import Promo Levels, all the values and items are correctly loaded in the promotion and promotion_data table. When the engine runs, it inserts new records in promotion_data table for items that are not related to promotions. The newly inserted rows are having is_self = 0.

So the question is, why does engine inserts records in promotion_data for items that are not related to promotion?

Any help is appreciated.

Thanks...