I have installed the local sales tax mod

Local Sales Tax Mod for Zen Cart Version 2.2
By:Heather Gardner (LadyHLG)
Based on several prior local sales tax mods.
Modifications by: Qian Gu (guqian)
Support Thread at Zen Cart Fourms --> http://www.zen-cart.com/forum/forumdisplay.php?f=37


and quantity discounts

Quantity Discounts Module for Zen Cart 1.3.5 and above
Version 1.8
Author: Scott Wilson
http://www.thatsoftwareguy.com
Zen Forum PM swguy


and am having problems with my order total. If I change the sort in order total so the quantity discounts come before sales tax, then the quantity discount is not included in the "Total Amount". If I change the sort order so it is after sales tax, then it is reflected properly in the "Total Amount" of the order. Gift Certificates (redeemed) are similar if the sort order is before sales tax in that the "Total Amount" of the order excludes the gift certificate in the calculation. However, if the sort order for the gift certificate is after the sales tax, the "Total Amount" is totally screwed up almost double what it should be. Can someone help me out here?
thanks.....