I am unable to log on at this time due to the server being down so I cannot show a picture of my resist stats while in a pvp zone. However, I have gone into the pvp zone and Hardened Carapace is not giving me the resistance to Lethal, Smashing, and Toxic like the tooltip says its supposed to do.
You'll need to hit up the Homecoming forums. Titan Network can't help. (https://www.cohtitan.com/forum/index.php?topic=13399.0)