Jaya's Immolating Inferno failed to get buffed by Torbran in a Brawl game I just played. I cast JII for x=2 with Torbran in play, intending to kill my opponent's 1/1, 1/2, and 5/4 (3/2 with two +1/+1 counters on it). It only did 2 damage to the 5/4 (killed the other two creatures). I have read the cards multiple times to make sure I didn't miss anything, there was nothing on my side or opponent's side to reduce or prevent damage. The only thing that may have affected any of the interaction was my Soul-Scar Mage, even though it shouldn't have directly changed anything about how much total damage the 5/4 should have taken, it did take off both +1/+1 counters. Unless I'm grossly missing something, I do not see why JII shouldn't have dealt 4 to each of the three targets in this scenario. Accordingly, I think this interaction is bugged.