Barbarian damage immunity bug

I noticed today, while playing Lost Valley DLC, that my barbarian is taking a beating but never needs healed. In Rage I was hit by a frost giant for 33. Should have been half damage but only received 3, verified in both chat and hp total. The 3 point hit was the highest amount of damage taken today. Dragon breath took a toll on my party. Was surprised for first round, everyone but the barbarian took a lot of damage. She only took 1 hp. Not in rage took 28 acid but only 1 hp was deducted.