Ok, not really a bug but kinda a pointless thing never the less
700 $99.95 (40% Bonus) +FREE Alien Ring
1450 $197.50 (46% Bonus) +FREE Alien Ring
Never ended up with the +Free Alien Ring since well, when I was 1st able to get the ring, now at level 92 its kinda a pointless thing for anyone that level to get from buying gems.