In your user profile, the Posts Per Day is the average over your entire membership. Your average of 6.2 is over the 34 months you've been here.Do you happen to know if current post rate (mines 6.22 per day) is based on your posting habits since joining or over a set period of time?
In my chart #1, the current post rate is based only on the last 6 months. The exception would be a member for whom I didn't have a previous snapshot, but that's rare since the member would have to get near the top without having hit my radar threshold 6 months earlier.
Ask me in 6 months and I'll know your overall rate, 6-month rate, and the balance between the two that I called the computed qualifying rate (for Chart #3).
The same applies to Scepticalscribe: 2.9 post per day average over the 77 months since joining; better data next time.