Error Redeeming Reward due to Change in Price

I wanted to buy "Roblox Digital Card—1000 Robux" which is for 16050 points but i had set my goal before its price was changed, earlier the price was 15000 points and with a 200 discount its price had reduced to 14800 points, but when i tried to redeem it says "Sorry you do not have enough points"

On clicking manage

 On clicking redeem reward