Cadence Running at the treadmill!

I have seen this error on many recent Garmin watch
When you run above 8 km/h = 5 mph the cadence is calculated correctly.
They should fix this error because it has been there for over 2 years.

Are you using watch alone or with strap like HRM-Pro (Hrm-Run), maybe foodpod??

What about pace? Is your pace proper?

What about total distance? Is it the same on watch and treadmill?

Did you ever done distance calibration on your watch after run?

Are you do your workouts on same treadmill every time?

Is your arm, with the watch, swinging differently than when you are running outside?

Thank you to who I can write? To fix that 

Hi, thanks for answer and ask, I just use the watch with out anything else.  Yes the pace is look ok also. The distance in the treadmill is less about 2 km less that in the watch. I use the same treadmill always. And I didn’t do calibration never before 

No I don’t think so 

I suggest read manual, do calibration and then check data.
Food pod or HRM-Pro also should help.
But definitely, watch calibration is something what you must do.

Same problem, I know exactly the feeling when running. At pace 5.00 min/km (12km/h), the watch shown cadence 184, but I am sure that, it should be 192-194. Because running outdoor, with that pace and that feeling, it is show correctly, both in Garmin and Coros. Already calib the treadmil. Dont know why, this issues is not happended before.

Could you compare cadence against your average steps length for outdoor and indoor run?
Maybe here is the difference?

From my side, Cadence is not related to pace or stride length. On the watch has the gyroscope, and it's function is detect the movement, then the watch will use it, then report to the screen about cadence. For example, if you want, you can run pace 6.0 with cadence 190, no problem. so, the watch seem like has something wrong in the cadence calculation formula.