Yes, a lot went wrong with bursting and the communication about it.
In patchnotes like: https://worldofwarcraft.com/en-gb/news/22824893
we can find it is upgraded on 14th December from 5 to 7% per tick.
And then a blue says this the 23rd of Januari.
Contradicting and confusing.
Wowhead also claims it is 14% total. I am pretty sure it is. But what a mess.