Delegated confusion.

Okay I am officially confused here. While I took a break from the steemit platform, I decided to delegate most of my SP to the Hive account@minnowbooster bot. I figured that if I 'm not writing I might as well get some income from minnowbooster bot.

So I was under the impression that the delegated SP could not be used in the reward calculation.

So last week when I wrote an article while my SP was still delegated, I got 2400+ votes and an amount around 5.40 STEEM. As I planned to pick writing again I thought better undelegate my SP to the Minnowbooster bot so that I could enjoy my full earnings.

However today I checked and to my surprise the amount of my article is as low as it was when my SP was delegated. Am I missing something?