Hello

I have HPS Cartography Kit and it shows that a discount should be applied to the Pixel set, but when I bought the Pixel Set it didn't apply at all. 

The discount requires you to have all three previous tilesets:

HPS Doodle Tiles

Tiles of Xark!

HPS Cartography Kit

And the discount price will be shown before you pay.

If you already have all my other hex kit packs in your itch library you get a discount on purchasing this one!

Ah, sorry, I misunderstood the discount then.