Breadcrumb links, also known as contextual links, are a type of navigation aid for Web pages. They provide a textual representation of a site's structure, usually a vertical hierarchy of a site. For example, on ecommerce sites, breadcrumb links often have the following format:
Home > Category > Subcategory > Product
On a larger site, the breadcrumb format might be the following:
Home > Channel Page > Category > Subcategory > Product
On a smaller site, breadcrumb links might have a very simple format:
Home > Category > Product
So your problem is this that you are reaching to the same page through the different way..
there may be two reason behind this
1. your pages are depends on particular search results.
2. there may be some navigation mistake..
But according to me this is not a problem. We are normally use a main page in the different format..