hi @candycrush5555You are warmly welcomed in the community.I understand your statement, the King is working every second to improve the game. already they change maximum old level to new shape, I agree that the level is changed, so the video does not match. But let's say you try a little bit, you can surely complete them.
A Warm Welcome to the King Community, where you can seek Answers / Suggestions from your fellow players
With regards to your question about seeing the level again must be because, the King Team has brought back the "Test feature" on some levels. Because of this, they have changed some of the levels both lower and higher levels. That is the same reason, we have been seeing either completely different board than the one in YouTube videos or almost the same board as the one we have played before.
Please read the post by one of our Community Manager @QueenMia for your reference and to know more about it. Please follow it once a while, so that you will know if there are any updates with this regard.
Hope this answered your Question. Have a great weekend