Why are cart IDs in Metorik not sequential?

When you're looking at the list of carts or viewing a single cart in Metorik, you may notice the cart ID:

If you're wondering why sometimes a number will be 'missing' or it could go from '#2' to '#4', don't be concerned. This can be for a number of reasons:

1. Something went wrong when Metorik was saving the cart so it saved it with a different ID.

2. The cart was deleted (due to a customer opting-out of cart tracking).

3. The cart was deleted (due to the same customer checking out with a different cart - eg. after they log in or log out or use a different device/browser to purchase - as we delete their duplicate/redundant carts).