PERSONALY I'm crashing out over this, I que into pfinder raid in NA and it keeps putting me into EU.
I get its probably trying to fill the party to full but I physically cannot play properly on EU.
This might be the same issue for other players as well and even the other way around so PLEASE just put the NA players into NA parties and EU players into EU parties
Also quick change just add a Toggle on the Party finder that Shows; EU | NA | ALL
and depending on the selection that's what party you search for in Raids