I've posted 7 times in the last 3 years and I still have an average of 1.96 posts per day.

See Above.

Must be a glitch.

^^ or not.

Xaqaria, if you take you full post count of 5,592 and divide it into the 8 years you've been a DV member, it works out to an average of about 1.9 posts per day, which is about what was listed. You haven't been around much in a while, but your substantial presence in the past is still influencing your average per day.