Even if its a display issue, the fact is they still hit too hard. It's not hard to notice that after 1 style and 2 DD's you lose quite a chunk of hit points starting at 100% dropping to 65% or even lower.
I believe it to be a display issue but I think what you see displayed on your screen is the true damage not what the skald/bard/minst sees so yes it is doing way to much damage and needs to be fixed but who knows when the server will be back up again if ever.