questionswhy do i lose reputation when i comment that a…

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Nothing that you mentioned should have led to a decrease in reputation. That leads to two possibilities: first, perhaps something else happened - deals you had posted were deleted, for instance, or second, since your rep is a measure of how you stack up versus everybody else, you may have been surpassed.

You also may have been caught up in changing reputation systems - depending on where you saw your reputation (like, at the top of the screen), it may not have properly reflected your current reputation. If you were 97 under the old system, and hadn't logged out and logged back in yet, the top of the screen likely would've continued to reflect 97, even though your rep is truly 90.

At the end of the day, keep participating, and you'll be all set.

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http://imgur.com/Y9l6Y is an example of what I'm talking about. I just took that a couple minutes ago - this is at work, where I don't really ever log off. If you check my rep next to this post, it won't match up.

vote-for3vote-against

@adhurt: The reputation by your name is only updated when you log off, and then log back on. Your current reputation is correct.

[Edit] I wasn't clear. I'm referring to the reputation box at the top of the page, where it says "Welcome, adhurt" and then shows your square and triangle. If you look at the leaderboard, it will match the reputation at the side of your posts.

[Edit again] I also see that I should NOT break my rule about commenting before adequate caffeination. I misspoke originally, thinking that it was @dcalotta that was confused, rather than @adhurt. I also note that you can indeed see a drop (or rise) in reputation over mere comments, especially as you become active after a period of inactivity (even I sleep now and then).