Wrong Stride with RDP after firmware 16.30 update

My watch has indicated wrong stride (around 0.5m) when running since 16.30 update.

Based on other data, the stride should be indicated as 1 meter or more.

And it still goes on after 18.20 update.

I found other models had the same problem.

Some have solved by frimware update, some have still happened.

Does anyone have this problem?