Hi,
It's not incorrect. It's just another convention on how to calculate the taxes. For online shops, it's common to calculate taxes like that. And accounting software usually calculate the taxes like you want.
I suppose that you have the "round prices during calculations" setting activated in the Hikashop configuration.
And so, the taxes are calculated per item, then rounded, and then the taxes are summed for all the products.
So it goes like that:
tax for one product: 1 * .092 = 0.092 -> rounded to 0.09
tax for all the order: 0.09 * 13 = 1.17
If you don't want that, then you want to turn off the "round prices during calculations" setting.