"If the target is currently affected by your Ignite, it also burns the target for additional damage equal to the damage per tick of the Ignite every 1 for 10 sec."
Is this just bad wording? Otherwise not sure what "Every 1 for 10 sec" means.
Anyone have comparison data from the PTR? Unfortunately there's nothing in this datamined description that indicates the combustion "Damage has been increased to bring it up to approximately the same level as before.": Source.
Note that the datamined version on Wowhead shows the same wording (albeit it shows a range for the initial damage unlike the wowdb version).