Multiple authorizations on customers credit cards when ordering

[Vicki_Reale]

In recent weeks, we've been noticing that several customers have had multiple authorizations on their cards when ordering. It seems to have coincided with when I implemented Shopify tax.

Example:

$45.71 USD was captured using a Mastercard ending in *990.
5:43 PM

$45.71 USD was authorized using a Mastercard ending in *990.
5:43 PM

Authorization was voided using a Mastercard ending in *990.
5:43 PM

Tax amount was updated from $2.61 USD to $3.69 USD.

5:43 PM

$44.63 USD was authorized using a Mastercard ending in 6990.

NOTE IT APPEARS THE ORIGINAL AUTHORIZATION FOR $44.63 WAS VOIDED BECAUSE THE TAX AMOUNT WAS UPDATED. THIS SEEMS TO BE AN ISSUE WITH "SHOPIFY TAX".

IT'S NOT CALCULATING THE CORRECT SALES TAX FOR ORDERS BEFORE PUTTING THROUGH THE CARD AUTHORIZATION, SO IT'S AUTHORIZING, THEN CALCULATING TAX, THEN HAVING TO RE-AUTHORIZE THE CARD.

MY CUSTOMERS AREN'T HAPPY AS THIS TYPICALLY MEANS THE ORIGINAL AUTHORIZATION HOLDS THEIR FUNDS UNTIL IT EXPIRES (SOMETIMES DAYS LATER) OR GIVES THEM ALERTS THAT THEIR CARD IS BEING AUTHORIZED MULTIPLE TIMES, WHICH MAKES THEM ASK ME IF WE "CHARGED THEM TWICE", GENERATING THE NEED FOR ME TO EMAIL THEM BACK TO RE-ASSURE THEM.

Then when the order imports to our Sellercloud system, it shows the order as overpaid since Shopify submitted 3 separate payments for the order.

Is anyone else having customers complain about this?