To see the issue you can log into the GA4 account and select Explore and choose Blank. Once once the blank template is created change the Technique field to be User Explorer. If there are a ton of events for the user with 0 then that is likely the issue.
To fix the issue you can manually update the GTM-DataLayer.js resource.
Change this:
Code:
basket: { basketId: '&mvtj:global:Basket:basket_id;', custId: '&mvtj:global:Basket:cust_id;' },
Code:
basket: { <mvt:if expr="g.Basket:cust_id GT 0"> custId: '&mvtj:global:Basket:cust_id;', </mvt:if> basketId: '&mvtj:global:Basket:basket_id;' },
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