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I check your posts, and for sure day 22nd is counted wrong. I don't see issue with time of posts.
About the bot and posts counting - from my observation, sometimes posts after 5pm (forum time) are counted for next day, sometimes posts before 7pm (forum time) are counted for present day. So if you want to be sure for which day post will be counted, just do not post between 5pm and 7pm forum time
That has a simple explanation. Say, you make a post at 5 PM forum time, but if the bot queries the forum after 9 PM forum time, which will already be a new day from the bot's point of view, your post will be counted toward the next day. So if there are time-out issues involved, and the bot fails to get the post counts for today, it may potentially count all posts from this day as tomorrow's. But since you can only make so many posts, you may start losing posts
The bottom line is that the bot needs some patching as it is stealing from us