Hi Dustin,
According the the SmithCart Change Log, there was a fix for a querystring issue in 5.20 however I don't see anything else listed for any later releases. I tried to replicate this issue on my test portal using version 6.50 of the Cart but I was unable to reproduce the issue, the unit price of the Product was correctly applied on the Cart screen. This may indicate that the issue has already been resolved in a recent release or that it is related to your specific configuration.
Are there any Variants associated with the Product you are adding to the Cart?
Are there any errors being logged to your DNN Event Viewer?
Please post a screenshots of the following screens on your site and I will set my test site up to match your settings:
- Store Settings
- Product Setup screen
Thanks!