Why supplies and demands suggested due date is earlier than need by date?

Summary:

Why in Supplies and Demands supply order's "Suggested Due Date" is preloading 6 months before its demand's "need by date"?
Constrained Plan

Content (please ensure you mask any confidential information):

Item 120 is a buy item that has a "Planned Order Demand" 70345267 with a "Suggested Due Date" = 09/29/2024. When the end demand item: 102 has a "Planned Order" 70345267 with a "Need-by-Date" = 05/04/2025 and a "Suggested Due Date" = 03/16/2025. Also, the end item planned order has a "Suggested Dock Date" and "Suggested Ship Date" = 09/29/2024. The end item 102 Forecast "Suggested Due Date" = 05/04/2025.

Why is the end item's Planned Order 70345267 "Suggested Dock Date" And "Suggested Ship Date" way earlier than the "Need-By-Date"? What is causing this? Leadtimes?