Hi,
MacOS will move some menu options into the OS menus if the names are common like "Options". They menu items exist but under the OS menus and not the XyGrib menus. If the name of the menu is set differently in the translation file, i.e. "Weather Options", then the OS sees the menu item as belonging to the software package and not as a common OS menu item -- and it will appear where expected.
Try to use names that are not common with the Mac OS.
David