I've heard of the supposed 20% parry cap for clerics, and the supposed 20% dodge cap for rogues? Do these exist? Or are they just lies and slander?

Also for rogues(what I tank as), would that be 20% dodge before or after False blade? I'm assuming False Blade wouldn't be affected, but the 5% dodge talents in Bladedancer would be. This would be consistent with the fact side steps gives us 50% dodge and acts as a self buff, which works fine and actually does increase our dodge by +50%.