The product's page mentions "If you already own Ozymandias: Bronze Age Empire Sim, you'll receive a 55% discount on this Deluxe Edition."

I recently obtained Ozymandias: Bronze Age Empire Sim from an Amazon Prime GOG code.

However, no discount is being applied. Anyone else with the same problem?
Thanks for any help :)

Nevermind... Refreshing the page a couple of times and a few hours later revealed the correct 55% discount.

I didn't even know there was a deluxe edition because it's not all one one page with the drop down menu to select different editions. I only noticed it now because it's on one of the sales and I was browsing with the filter applied to hide owned games. I do not see any discount other than the current 45% off discount from the sale. Why cant they just make a purchasable upgrade to the base game?