Parsing is to take a string of characters and identify where one word ends and the other starts. We do it automatically, but a computer needs a bit more help in doing that. Depending how this computer program takes apart your tweet, there might be problems if you use certain characters which it doesn't expect. Humans are great at dealing with the unexpected, computers are not. It probably doesn't expect anyone to use the ":" Might well be that other characters don't work either. And no, you can't do the parsing for the 6WCBot
In fact, the bot is there so that you don't have to do any of the statistics yourself and just tweet what you've done.
And generally nothing to do with the 6WC reflects on twitter in any way, the bot is only a program running on twitter instead of your home computer. Twitter is just a way of interacting with the program.