Discount: -10% vs actual price displayed

Go in the menu Display->Content modules and edit the module with the id 84. There, change the taxed price option so that it displays the price before discount.
That's because pages don't use the same menus/modules on your website so you need to set that option in each one.
You should also set it in the Display tab of the configuration so that next time you create a menu/module, it directly has the correct option.

Could you do a screenshot of the option page for that module 84?

As I said, you need to change the option for the discounted price in that module.
You set it to "display the discount amount" so it's displaying the discount value which is 10%. If you set it to "Display the price before the discount" it will do what you want.