Item Fulfilment Defaults to the a Different Location other than what was Set on the Item Record

1. Navigate to Setup> Customization> Transaction Forms

2. Hit Customize on the Standard Sales Order form or Edit on an existing customized sales order form.

3. Click on Screen Fields tab> Columns subtab

4. Mark the Show check box for Location

5. Assign a name to the customized sales order form

6. Hit Save.