I have seen instances like this before. The timing of posting for events (registration renewals, ownership transfers, service records, insurance claims etc.) typically depends on how soon Carfax gets (or purchases) the data from their sources. I once saw a $30k accident (~$50k vehicle) not show up on a Carfax for nearly 2 years while routine service history on my prior cars was updated almost immediately.
You could always open up an inquiry with Carfax but I surely wouldn't lose sleep over it.
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