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I had 6735 on the old Forum from Dec 2004 to March 2019 (6735 that`s sad innit?) about 9 a week but they all discounted now 😞
You've amassed over 2000 'activity points' (and still have if you take a look at your profile) based upon your activity in the community but your 'post' count is correct at 396.
As Andy says, the counter was reset when we moved from the old forum to this one and noted in the FAQ's we circulated at the time.