It is not weird in the slightest. These things are coordinated at the state level all the time.

This is probably one of those good tests of "is your 'conspiracy theory' meter properly calibrated", because if it's going off right now and you are in disbelief, you've got it calibrated incorrectly. This is so completely routine that there's an entire branch of law codified in this way called the "Uniform Commercial Code": https://en.wikipedia.org/wiki/Uniform_Commercial_Code and see the organization running this' home page at https://www.uniformlaws.org/acts/ucc .

And that's just a particular set of laws with an organization dedicated to harmonizing all the various states laws for their particular use cases. It's not the one and only gateway to such laws, it's just an example of a cross-state law coordination so established that it has an entire organization dedicated to it. Plenty of other stuff is coordinated at the state level across multiple states all the time.