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You’re right. I do not have any boards on ignore, and I’m seeing 348 posts in your profile, but 350 on your history, with no gaps in between the post numbers.
Same goes for my profile: post count stated 3519, but posting history 3531.
The post count I think goes out of sync for undetermined reasons, as sometimes happens in the post count on threads themselves, and may need the forum to perform some sort of sync/recount every now and then to correct the issue.
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You’re probably right there. OP has two posts in Serious Discussion, and as per what you mention (detailed here:
Rules for Serious Discussion and Ivory Tower), they are accountable for the two post difference in the OPs case.