Geopotential Height (GPH) Forecast combination with other layers.
I choose "wind" and the "GPH" layer (let say for 500 hPa).
If I move the time slide bar, the two fields work simultaneously.
The same with "temperature".
if I choose any other field (let say "rain") and move the time slidebar
I can see the rain evolution with time, but GPH remains the same.
I observe the same problem as you. Geopotentiel Height isolines are often blocked when the time slider is moved, either with Wind, Rain or Temperature layers.