Yes, I think there is still some confusion here?
You donated for 10 Fairy Coins this month and you got the Queen's Shoulder Ribbon (Periwinkle) and the Queen's Rabbit Ears (Midnight Blue) for donating for 10 Fairy coins as you should have.
I am not exactly sure why you think you should have gotten a second pair of them?
Last month you also donated for 10 Fairy Coins and you got last month's 10 Fairy Coin donation perks, which were the Queen’s Heart Bunny Ears (Soft Ruby) and Queen's Ribbon Horns (Bright Berry) for it.
It does not stack, you only get the donation perks for the amount of Fairy Coins you donate within a calendar month.