Quote Originally Posted by markbarendt View Post
What mode is the meter in?

If it is in Shutter Priority mode it will display fractional/decimal F-stops. That's the only way it can get it right.

Aperture Priority mode will/should keep a constant F-stop (i.e. exactly f/5.6) and time will instead float to get it right.
I agree, in A priority it should stay where you put it. Is there a bit of (+.10) compensation dialed in?

Following along this line of thought, you should be able to choose whether you want 1/10 or 1/3 stop displayed.