Main Navigation Aligment

Hi there,
I have a problem to align menu to the right.
I’m using Navigation Style – Regular.
I can see drop-down menu with Left-Center-Right.
I can chose Left or Center and it updates on the site without any problem.
But when I choose Right and Save Changes the adjustment doesn’t work. It still shows the menu in the Center (both in Theme Option and on Page view). I tried several times but any time I was changing it to Right, it was overwritten again back to the Center.
Can you please help with that? Why the Right choice is not accepted by the theme?