How to stop multiple card authorizations

[harpstcg]

Every single order someone makes in Texas on my site requires sales tax to be charged results in a double card authorization which makes customers very mad as it can hold up their funds especially if they use a debit card.

Every order follows this pattern:

Checkout ->

Shopify calculates tax ->

places an authorization ->

recalculates tax (different amount now) ->

cancels old authorization ->

makes new authorization and charges

Note that all of the above happens immediately. Also is the customer being shown the incorrect tax amount that it initially showed? Why is shopify tax so stupid, how can I fix it?