Oh yeah, sorry, I was about to answer but have been interrupted. I won't go into much details, but to sum it up, your screenshots show a mix of problems of what I enumerated above. A small info that will explain almost all screenshots is that your base damage is quite low and you only gain additional damage bonus which is added on top at different points in time (or in the calculation). That's why you don't really see much change sometimes or why it behaves weird. But there are also some bugs, that's true.
