@vardo, post a screenshot and point the value you're refering to as well as post your current stats build. If you're talking about skills such as killing blow, uppercurt, etc it's impossible to display 0 as an output damage. Also note that some classes will be weaker and some stronger during the first few resets otherwise it's impossible to balance characters in both early stages and upon reaching full stats at the same time, hence RF does ridiculous damage close to ~ 2KK in a rebirth server and don't forget that skills such as chain drive can hit up to 8 times in one hit.
I see what you are refering at now. Yes, that is correct and the official server displays the exact same thing too because rage fighter is not using any magic damage. Just to clear any doubts, below I have attached a screenshot from retail (currently running on S12) that confirms this is correct.