Joomla 2.5.16, VM 2.0.22c
I have a state sales tax configured - Tax per bill, +% of 2.9, Currency = US Dollar, Country = US, States = Colorado - all other items are "Available for all"
For orders with Colorado addresses, some orders display the "Colorado Sales Tax" label but have $0 in tax, other orders show the correct amount. I have no unshippable products, have no special tax-free products. I am not able to determine a reason for this inconsistent behavior.
Any suggestions?