Discount shown is only half of the Fixed Spend entered in the Planning buckets

Hello Experts,

We are trying to create a TP with 2 Retrospective Spend Method conditions, one for Unit and other Lumpsum.

When the discount amount is entered in planning bucket for the Lumpsum discount method condition, the value gets distributed in half for the accounts in a Account Hierarchy (Trade Promotion is created at hierarchy level)

Can you please help me, how this can be investigated to know the exact cause.

Thanks,

Dinesh Rupraj