Probably a combination of strong riders, miscalibrated power meters, wrong virtual power (wheel slipping, tension wrong, wrong trainer selected), defective smart trainers, and finally people who accidentally or deliberately entered wrong info like their weight.

The trouble is, there's no way to know who's who and who does what on the Internet. We are all just a screen name and an avatar.

Reminds me of the saying. The Internet! Where men are men. Women are men. And teenage girls are undercover cops.