I bought all possible for the day, which was 2 of 10 and 1 of 5.
Then I opened all 25 of them.
Went back to the store and it would say that the daily purchase limit was reached for those items.
I went into the bundles tab, same message.
Then I decided to buy Leona chroma pack. When the bundles tab reloaded, I could buy the promo chests and keys bundles!
So i did as shown in the picture. :D
I'm sure this is a rare bug, but its still a bug.