Low Bonus drops

Has anyone experienced that this event has a worse chance of getting the bonus drops? In this event, I've noticed that the drop chance for Ithano is extremely low. I invested 600 energy and only got 8 shards. Has something changed? Last time, I was able to get the new BB almost to 5 stars, but specifically, Ithano seems to have a very low drop rate. I've even farmed single data fragments.