There seems to be an issue with txtQuantity textbox fields. Users are allowed to enter decimals (i.e. "1.5"). Although with sub-total going across the grid shows the whole number calculation the sub-total and total at the bottom of the page are picking up the fraction amounts
I suggest the validation should be included that will only allow users to enter whole numbers anywhere a quantity can be entered. Also the mini-cart displays quantities as a 2 place decimal. This should be changed to whole number with NO decimals.