It sounds like it is possible that you may have added an add-on that required an upgrade or an extra charge.
To see what you are being charged for, please follow the instructions in this FAQ
https://ttlc.intuit.com/replies/4202093
As long as you haven't paid, registered, or deducted the TurboTax fee from your refund, follow the directions in this FAQ to remove all unwanted add-ons.
https://ttlc.intuit.com/replies/3301994
Here is the current cost of each product.
https://turbotax.intuit.com/personal-taxes/online/
Please follow the instructions listed in the following
TurboTax FAQ to contact Customer Support if you need further assistance. https://ttlc.intuit.com/replies/3300041