probably just didn't explain well enough
Not a trick question! It is bowed along the length, so none of the pictures describe the issue.
I don't have a handy picture so I'll try to do it like this...
If you are looking at the board not from the top, not from the end, but the whole side, this is how it looks:
so the two ends are thinner than the middle. It was cause by one side already being like this, and bad jointing skills (it's been a while) to make the other side be a pain in my rear.
I am guessing I have some hand planing in my future?