Discount on Invoices Not Posting to Database Correctly

[FloridaGoFishing]

Hi, I have hunted around and can't figure this out. My version is 1.50 and I am using TaxCloud to calculate taxes which might be part of the issue but they say it is not. My customer uses a discount coupon code and he is invoiced the correct discounted amount. Everything works fine, they get a copy of the invoice and the orders processed. But in the Zen Cart database, the discount is ADDED to the order total even though it shows a minus sign in front of it. I use CartSpan to import orders, and it works flawlessly until a discounted invoice is in the que and the transfer fails because the invoice does not balance. And Tax Cloud's admin panel only registers the net invoice ignoring the discount. So what I think is happening is that the discount is not posting to the SQL database correctly. Here is a screen shot of the invoice inside my Admin panel showing the discount getting Added to the total instead of deducted. If you could tell me where to look to fix this error I would appreciate it. My store is floridagofishing.com/shop