A user hat created two Quotes related to an Opportunity.

 Root Cause:

The Primary Quote field must be included in the Calculating Fields field set to trigger synchronization between the Quote and Opportunity.

 Steps to Resolve:

Navigate to Setup > Object Manager > Quote.

Locate the Calculating Fields field set.

Add the Primary field to the field set.

 Testing:

Change the Primary Quote for an Opportunity and verify that the Quote Lines and Opportunity values sync properly.

 Salesforce CPQ Reference:

The Calculating Fields field set ensures proper updates between related objects during key actions like recalculations​​.