Okay here is what happened. I logged into WPSE an hour ago and saw my reputation is 504 and have I got one more privilege. That was good and motivating. ;)
There was a questions that I flagged and then I commented on one more question. After 20 minutes when I visited WPSE again I saw I have lost -15 reputations. So, now I am just curious where I have lost them as my reputation page doesn't list the reason of -15 reputations. Though it lists previous deductions.
As you all know must have known by now that I am very new to WPSE and trying to get the hold of how WPSE works. Please don't take me wrong I am just curious and wanted to know why that happened.