Why planned orders are being recommended very early despite having due dates in later future?

Summary:

We are running a constraint plan with two level Production and Manufacturing i.e., MPS and MRP level in a Process Mfg. Org. In the Manufacturing Plan, dependent demand feed comes from Production plan. Few of the ingredients/components are recommending planned orders very early despite having need-by date from dependent demands in future.

One of the items issue explained below:

Planned Order for Item A - Buy Item.

Need-by Date: 09/29/25

Suggested Order Date: 08/29/2025

Suggested Ship Date = Suggested Dock Date = Suggested Due Date 08/30/2025

Only Processing LT exists = 10 days, Compression = 9 days

There is no supplier capacity, supplier calendar or any additional calendars, and the Inventory calendar is 7 days ON.