Vertical Oscillation, Running Stride Length, and Ground Contact Time are not calculated when not connected to iPhone

I've been running with my watch series 6 (OS 9.3).

But after the outdoor running workout it never shows my Vertical Oscillation, Running Stride Length, and Ground Contact Time.

It happened only when the watches not connected to iPhone.

• Calibration was done. Calibrate your Apple Watch for improved Workout and Activity accuracy - Apple Support
• Pair and Unpair as well as reset the watch also done.

But none of the above can work.

Please help.