Unsolved Display isolines does not switch between layers

[TomSlavkovsky]

Safari, Opera, iPad: the “display isolines” box does not switch between functions. When the geopot. height, temperature, and freezing altitude are selected it will show the previous layer.

It works fine in Chrome. (?)

[idefix37]

@tomslavkovsky
Geopot. Height isolines are blocked also when switching from ECMWF to GFS.
e.g. when switching at same date between these 2 models for Temperature at 500hPa and Geopot.Height isolines, the Temperature layer changes but the isolines stay stuck to ECMWF isolines.
Seen on iPad.