I'm afraid the response you gave for my bug does not address the bug I reported.
I've triple checked this in combat, and the Swamp monsters (Which are heavy infantry.) """ARE""" showing doing -20% damage modifier to me, and NOT just on retaliations, but on direct attacks, every single time. (They do +30%, -20%, giving me a +10% shown.) They do not have this -20% modifier when attacking any other unit I have, only axe men 2.
So unless the issue of having incorrect retaliation modifiers also applies to normal attacks, then this is still a valid bug.
Don't get me wrong, I appreciate having stronger than normal units, but it's still either a description bug, or a game mechanic bug.