GB VAT Rates via API turn to 0 when total exceeds a value

Using the “create draft order” API, and the shipping country is Great Britain, the API returns a VAT tax rate until the amount exceeds somewhere between $215 and $233 USD. Is there a reason in tax law this is occuring? Is it somehow related to duties?

Total: $215.40

{
    "taxRate": 0.2,
    "taxAmount": 34.46,
    "chargeAmount": 206.78
}

Total $233.35
{
    "taxRate": 0,
    "taxAmount": 0,
    "chargeAmount": 186.68
}
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