As I understand it correctly;
parameters in the font tab are for the whole font (masters and instances),
parameters in the masters tab are for the masters and instances,
and parameters in the instances tab are only for the instances
??
It was just a problem with the parameters, which are on different locations.
For that I asked which parameter applied to which part of the font, and which parameter was more determined than the others. It is a little confusing the way it is now…