Eternal flame is one spell that has been changing quite a bit on the PTR. They reduced the initial healing by 30% and changed that Illuminated Healing would no longer proc from periodic healing. Now, they had change it once again to increase by 40% all of that periodic heal over time effects.
This changes seems to be a way for them to compensates for they made the initial periodic healing change.
Then again, this is the PTR, and blizzard has been changing eternal flame quite a bit, so we could definitely see some changes before the patch is released.