Irelia Bug. Incoming "better nerf irelia" jokes

I'm a big fan of Irelia, but i just got done spectating as well as playing against Irelia. I noticed something wrong with her E. I know the trade off of having lower health then the enemy allows her to stun her opponent for a quick outplay or maybe even a quick escape. But, i started to notice something odd when she has an obvious amount of higher health then her enemy. Her E is now stunning her enemy (from time to time) which who has less max and current health then herself. For instance, i played jax just 30 mins ago. She had a combined item set of Banshees, Triforce and randuins, or over 3k health. Meanwhile, I am sitting at a measley 2.3k (Giants belt and Triforce). As i proc triforce with q onto her, her banshees would still dodge the damage of the Leap Strike, alright, so i then W as i activate counter strike. She then Es (procs stun) me and continues to kite out of my counter-strike. (fair play, if i had already dealt over 2k to her) and we all know Jax does not do 2000 damage in 2 spells, sorry RIOT you cant touch jax for the time being. So, if we could please test my theory to make sure I am not going crazy or am just missing something. Thanks!