I thought it was just me.

Two Seleukid Somatophylakes did that to what had seemed a very solid KH army :(
As you can see, my guys got lots of kills & I'd have had them if those blasted Somatophylakes had died, instead the cav just took apart my army unit by unit in melee combat.
I hardly hurt them at all & that was with my main force directed at them because I knew they were the danger.

It's funny though, in my other campaigns so far I've been able to combat the Hellenic Heavies without too much fuss with similar units

It was my first EB campaign & on 0.80 so could be they changed stats since? Or there was a bad balance of traits or something that I didn't know to check for. Either way, I keep this image as a reminder of the damage that can be done. (& yes, that was on medium battle difficulty)