Approved Shipments Forecast measure getting values even when Final shipments forecast is null

Summary:

we performed approve plan, and an item with null values in Final shipments Forecast measure showed values in Approved Final Shipments Forecast for past weeks.

Why so and how to remove values from Approved final shipments forecast measure.?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):