I am not sure I understand your first sentence, but SP delegation is when you delegate to another user for them to use. I have this post about it: https://steemit.com/steemit/@gmichelbkk/how-to-delegate-steem-power-easily

In your wallet I see "Transfer 15.000 STEEM POWER to imran-aslam" which you have now. I think that the previous 15 SP was from Steemit Inc in order for the account to run, and as you got your own, it was removed.