From what I can see in the logs, you're getting hit still. You're armory shows you at ~100.83% unhittability, with raid buffs I can see this going over 101.6 but maybe just barely? (remember defense miss has steep DR that unless you use a macro for, is difficult to figure out).
according to this, you took 200k worth of damage just from regular hits, so either they're positioning around you and getting hits off from the side, or you're not unhittable. Also the average attack that gets through even on a block shows to be around 3k. when fully stacked at 9 debuffs that's 225% more damage, it's very possible those 3k hits are gonna start hitting for upwards of 5k. I do notice that this was a wipe so some of those hits, crits, and even the shadowstrike were made post wipe call, but 32 landed hits seems abnormal.
Spell Damage done Hits Crits Blocks Uptime Absorb Misses
# Avg Total # Avg Total # Avg Total Bl Do Mi Pa Total
Melee 602476 93.8 % 32 6759.2 216296 1 16544.0 16544 116 3186.5 369636 - 403724 291 221 96 186 84.2 %
Shadow Strike 40000 6.2 % 1 40000.0 40000 - - - -
642476 100% 33 7766.5 256296 1 16544.0 16544 116 3186.5 369636 - 794 (84.2 %)