New Blog Templates not Copying CSS (Optional) From Main Menu

Hello! I love this plugin. It's amazing. Thank you.

My issue is that the CSS (Optional) data from the Main Menu:
x-megamenu col-4
Is not copying over to the new blog, everything else is amazing.

One other question: Does this mean that ANY changes I make to this Template blog will automatically be forwarded to all websites created with it, pages, menus, settings, ect?