The newest discount added to all products + no discount stickers/icons shown

-- url of the page with the problem -- : outdoor-active.gr
-- HikaShop version -- : 4.4.0
-- Joomla version -- : 3.9.23
-- PHP version -- : 7.3.1
-- Browser(s) name and version -- : Chrome

Hello,
I have followed the following procedure to enable discounts in my shop:
1) Create discount categories (10,20...70%)
2) Create product categories "Products under discount" with sub-categories 10%, 20%,...70%
3) Create stickers that will appear on product images (bottom right corner) that show the discount percentage and assigned discount and product category to them.

Now all of my products automatically appear with a discount and their price is re-calculated without adding them in a discount category. Even if I add a product to a specific discount product category nothing changes. The only way to disable discounting is to unpublish all of the discounts. In addition to the above, the stickers do not appear on the product.
Am I doing something wrong here?

Thank you.
Antonis

Hi Nicolas,
I guess I am missing the second part of this step: create one discount for each category and assign the category to the corresponding discount.
I can't find where/how to assign the category to the corresponding discount. There's no such an option when I create or edit a category. I can set the parent category but I can't select one of the discounts I have already created and assign it. I can only set:
- Parent category
- Layout on product page
- Quantity input method
- Meta/keywords etc.
Am I missing something?
Thank you!

We have set this up recently and I think the step that you have missed is to set up the discount. Here iis a screenshot of our settings:
Under 'Orders | Discounts':