Please refer to this post. On macOS 14, the top line is the “normal” cursor, and the bottom line is the legacy, deprecated cursor that is no longer favoured by Apple.
Welcome to the future, and progress! 
(P.S. As noted there, we are not looking for feedback on this, because it is not our cursor. If you want to express your dislike for it, please head on over to Apple.com and let them know.)