When you post your own puzzle, there's an option to switch which colour is on the bottom. I think it's in the 'theme' section.
Yes, I know about that. But, Flip Board is on and Black is on bottom. So, Black should be on bottom when posted. But, after posting, White is on bottom. I can uncheck Flip Board to correct it. But, that's not the way it's supposed to work.
Why is the piece color in my puzzles showing first move color on top instead of bottom.
https://www.chess.com/forum/view/more-puzzles/queen-capture-in-3-moves?page=28#last_comment