First thing I'd check (but I'm too lazy to actually do this ATM) is your actual log files. The EQ client doesn't log everything you see in the chat window, and it's possible it leaves out the damage ticks from Shaman epics. If it does, there's nothing any log parsing program can do (you can't make something out of nothing).
But if it
is there in the logs ... file a bug report on NParse on its
GitHub page.
P.S. I'm not affiliated with NParse in anyway; it's just that "file a bug (issue) on the GitHub page" is standard operating procedure for open source software.