A Minnow Question: How did I Lose Half of My Delegated Steem Power?

Yesterday I had 27.81 Steem Power delegated to me by @steem:

Today I have 14.43 Steem Power delegated to me by @steem:

I have been on Steemit for 8 days now. Why did I lose so much delegated Steem Power? I used steemworld.org to check on the delegated Steem Power of other users that have been on longer than me and they still have 27+ delegated Steem Power coming from @steem.

I have read through the welcome page and the FAQ page and I have search on Steemit for the answer and all I see is information delegated Steem Power in general. I don't see anything on how long new users are delegated Steem Power for and how delegated Steem Power is lost for new users.

If you don't know the answer to this question please resteem it, so that other can see it so that I might be able to find an answer. I don't even care about the payout for this question. The missing delegated Steem Power is much more important.