If the name of the claim's assigned primary adjuster stakeholder isn't automatically populating within the "Adjuster" field, located within the "Commissions" section, of the "Claim Note" window, this is because the user record for that adjuster is no longer active.  Only active user records are eligible for selection within the three available commission fields.

To resolve this issue, either make the user record of the claim's assigned adjuster active before attempting to add your products and services items to the claim note or manually select a different, active record from the field's drop-list.