It’s mostly due to early “archeologists” being almost entirely trust fund babies born into the aristocracy and to whom it was a contest to make the craziest claims possible.

See the OG trench at Troy that went completely past the end of the Bronze Age and dumped all of the important artifacts into a refuse pile that is apparently still being sifted through today.

Also see early “paleontologists” who seemed to use Dino bones in an attempt to make monsters scary enough to make kids cry.