What was up with not stopping the clock on out of bounds?

I just looked to see if the rules have changed. According to what I found, the NFL rule is that if a player goes out of bounds making forward progress, the clock stops until the ball is placed at the line of scrimmage by the referee.

Yet at least twice today, I saw the clock continue to run after our player clearly went out of bounds, once a running back and once a receiver. I didn't even see a ref do the windmill motion to indicate he thought the player had been tackled or stopped in bounds. What the heck is going on?