The number of transactions doesn't match the number of validated purchases, why?

For a basket to be taken into account in the "Purchase process" analysis, the ID of this basket must be correctly entered in the transaction.confirmation event.

The basket identifier must therefore always be valued, throughout all stages of the purchasing process.

A transaction does not require a cart ID, only the transaction ID is required. This explains the differences between the number of transactions and the number of validated baskets.