Quiver (Matlab) in ParaView

Hi,

I checked it but I still don’t have the answer. I tried to add the attribute : “positive:up”
to the netCDF file but that didn’t change anything. Do I need to use a different netCDF reader? There is only one that is working
Is this by any chance related to the following issue:

Another thing : the colors of the U component should be the same after I write in the calculator : “U*iHat”, don’t they? but they seem like the inverse colors.