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I think I have been doing this long enough to know how it works. :)

Edit: Unless there is something new with vesting accounts, which would make no sense to me, every time I start a power down it's 13 payments 1 per week.

It used to always tell me "13 payments," regardless as of last week, which was after the most recent fork, I still got 1/13th of my balance paid out before I stopped power down.

Yeah, what you said sounds more familiar. I think you're right and I think that there might have been a change in the past year. And thank you!

Your account is over the "initial investment" or else you would show two steempower balances. I'm 99% sure it's 13 weeks for you, but who knows, anythings possible.

what does that mean that my account is over the "initial investment" ?

Basically when you join steem they give you ".50 cents" or whatever to start your account. Once upon a time it was a lot more than that, but it's different now. When you are basically using "borrowed steempower" that you haven't earned yet, you aren't fully vested.

sorry about all the questions, you're doing a great job answer so thank you for that!
So when one is fully vested they take away this "borrowed steempower"?
and what does one have to do to become fully vested?

You already are. Basically they loan you a tiny amount of steem to vote with and it's like they paid you a tiny bit of steem up front.