I do not think is is directly wrong. Good quality wood in the times of wooden ship building was a scares and expensive good, so they wood get most out of it. This means the stealers and dropplanks were fitted as directed by the wood used.There is a mistake!
I have just started the second planking, I am planning to change the dropplanks sequence. In the first planking the first dropplank (direction towards the keel) is longer than the second dropplank. I believe this is wrong, so in the 2nd planking am making the 1st dropplank shorter and am making longer the lower one.
See below some pictures of the use of dropplanks and this is not showing the lower one should be shorter, but it is directed by the shape of the hull, the flow of the planks and the wood used.