Stop in for a cup of coffee

Explain something to me cuz I'm stoopid!!

If H = T * RPM/5252

Given a torque curve for an engine, one could plot the HP throughout the rpm range...

The math says that torque and horsepower are always equal at 5252 rpm.
And horsepower is always exactly half of torque at 2626 rpm..
.....

So why do I see HP/Torque curves posted that don't follow the laws? Am I missing something?