Hello!
@KANNA-CHAN if you would like, you can send through a ticket to us in Support and we can confirm in your data, but there have been no changes to the drop rate of Orbs as well as nothing programmed in to prevent an account from receiving one specific type of resource over another to stop them being able to upgrade a Troop.
Orbs of Ascension do have the second-lowest chance to drop from a Chaos Orb though;
But as mentioned in the article, if something has a 1% chance of dropping it doesn’t mean that 1 is guaranteed for every 100 Orbs of Chaos you use.