Hello Ajeh,

I'm facing the same kind of problem with a small variation:

1) I created a 40% sales with "Ignore SaleCondition - No sale applied when special exists"
2) I applied this sales to 4 categories.
3) All products part of the first category are showing the right pricing for all prices per attribute (base + increment)
4) All the products part of the 3 other categories have the discount calculated on the base pricing only. Moreover, and for these 3 categories, no delta pricing show up in the "Total/disc" column in the "attributes controller" section.

All the products in the 4 categories have the option "apply discounts used by product Special/sale" enabled.

Do you know what I am missing ?

Thanks in advance for your support.

Saraniel