Like alosso said, double checking your settings is most important.
Something as simple as scrolling through your friends list while playing can change clubs. I've done it. The end result wasn't pretty. But then there are the odd times WGT just throws a wrench in the works and off the ball goes.
When putting from the fringe ALWAYS check the distance of the meter. Mine usually gives me my 50ft. meter even tho I'm well inside 20ft. If not on the fringe, check the green speed, and is it a down hill putt.
Lots of variables to contend with here but there are some very good posts on those things to be found thru out the forums.
Good luck out there.
SP