If you have enabled rotary in Lightburn, plugged the rotary into the panel mounted connector on the machine, and toggled the machine’s switch to rotary then the only answer here is to adjust steps per rotation or roller diameter within the rotary setup.
Although the values you have entered were provided by the manufacturer and may even be engraved in the rotary itself, they’re wrong according to your result.
Deeper into the equation, there are other factors that could have changed from those provided specifications e.g., the steppers and stepper driver for your Y axis which then in turn would possibly have changed the dip switch assigned Pulse / Rev on the driver (this completely changing the steps per rotation on the stepper motor on the rotary) OR maybe the motor used on the rotary was changed to a different model.
Dial in the values for steps per rotation and wheel diameter until it is accurate. Just to prove / show the affect of the change to the steps per rotation, go ahead and make a significant change to the current value. Double it or half it. You will see that by adjusting this, the rate at which the rotary spins will change.