So, according to the patch notes (here: Hotfixes - Updated March 10, 2020 ), the Draconic Empowerment buff for the cloak was supposed to have been buffed from 3386 primary stat to 3648 instead.
Indeed, at rank 12 of the cloak, that was the case.
I happened to look at my cloak today, however (rank 14), and the buff’s value is 3386. Same as for everyone in my guild that I asked.
Seems like the value was upped for a single rank, and ranks above 12 still have the pre-buffed value.