Samsung seems to be overcharging sales tax

So I've just ordered the newly announced Z Fold and Watch, and noticed after ordering that the sales tax on Samsung's invoice is higher than my local sales tax rate. My billing and shipping address are both in Seattle, WA, which has a state+county+city sales tax rate of 10.25%, but Samsung charged 11.275%.

Posting here (1) as a PSA for others to check their invoice, and (2) wondering if there's some obvious thing I missed.

The order is as follows (payment summary screenshot attached to this post):

• Galaxy Z Fold 512GB: $749.99
  • original $1919.99, -$120 free storage upgrade, -$1000 for iPhone 14 Pro Max trade in, -$50 for reserve credit
• Samsung Care+: $167.30
  • original $239, -$71.70 "limited time" discount
• Galaxy Watch 6 Classic 43mm LTE: $225
  • original $449.99, -$224.99 bundle discount

So, subtotal is $1142.29 as expected. Sales tax in my location is 10.25% (verified here), so the sales tax should $117.08, but instead it's $128.79, $11.71 higher than it should be.

Oddly, it's off by exactly 10% (of the expected sales tax amount).

I contacted chat support and all they could do was file a ticket internally and tell me they'll follow up in 2 business days. Screenshots of chat support: https://imgur.com/a/bdAaot7