I have gone though all of these steps and its working everywhere except the display at the top of the page on the “My Cart” button. I have installed other templates but have never seen this problem before.
Just to verify that its a template issue.
Can you temporarily switch to a default WordPress theme such as twenty seventeen and check to see if you’re still seeing the incorrect price. If it is the theme causing the issue I’ll report it to the developer to be fixed.
The issue here is the fact that the shopping cart is not getting the correct value from WooCommerce so we have to notify the developer of this issue so that a fix can be issued out.