Add To Cart Alters Price

[color=#282828][font=arial, verdana, tahoma, sans-serif]The error I've found is that my product is showing up correctly discounted depending on the user group, BUT when I add the item to the shopping cart it discounts it an additional 17.5%[/font][/color]

[color=#282828][font=arial, verdana, tahoma, sans-serif]Example:[/font][/color]

[color=#282828][font=arial, verdana, tahoma, sans-serif]Original price of item is $2400.00[/font][/color]

[color=#282828][font=arial, verdana, tahoma, sans-serif]Registered User group discount displays item at 15% off which is $2040.00[/font][/color]

[color=#282828][font=arial, verdana, tahoma, sans-serif]But when I add that item to the shopping cart it takes an additional $288.00 off my item (17.5%) bringing the final item price to $1632.00[/font][/color]

I do NOT have any cart promotions, coupons, etc. I only have a Registered User Group with a 15% discount and a wholesale user groups with a 30% discount. Those discount reflect correctly UNTIL the item is added to the cart.

[color=#282828][font=arial, verdana, tahoma, sans-serif]Anyone else ever run into this issue? [/font][/color]