Hi,
I don't understand what you meant. Isn't that normal?
What ever you define for frontpage-menu-item (yellow-star icon will appear next to frontpage-menu-item), then this will be shown on the homepage of your website. If you define "Single Article" as frontpage-menu-item, then "an article" will be displayed as Homepage. If you define "Virtuemart Frontpage" as frontpage-menu-item, then Virtuemart Frontpage will be displayed on the homepage of your website.
FYI: you have to define something as "frontpage-menu-item", otherwise your website's homepage will give
404/Page Not Found error. Alternatively, you can define an article for homepage and make that article completely BLANK (disable the article title from menu-item options so the title won't be printed), then fill the homepage with modules.
See this tutorial for more info:
docs.joomla.org/Managing_the_front_page
regards