On my psr if I edit the style,the reg will now play the new edited style.
I don't know if this is different in Genos though.
Maybe you have saved to a reg something
outside the style creator,e.g you levelled up the volume of the chord 1 channel and saved this change in reg1.Not to the style itself.
Anyway,
an easy way to "remake" a registration as long as you want to change just a couple of things in the reg each time,
is to push the reg1 button first, apply the changes you want (e.g change the variation of a style in the reg) press save+reg1.
All the previous data of the reg will remain unchanged.
Do that with all the reg buttons and at the end, save the registration.
Not a good idea to change a reg while we mess around to find out a thing we want to change.
Find what you want to change and test it and then recall the reg first and re-do the changes you have tested .
Otherwise we may change something we shouldn't without knowing it.
I have done this mistake many times