[Plugin: WP e-Commerce] Product Category Issue!!!

Now I have a wp e-commerce category page as follows:
mysite.com/products/necklaces

and I have an independant gallery page as follows:
mysite.com/necklaces

now when I go to mysite.com/necklaces, WP thinks that it is WP E-Commerce category page and I see ‘Edit Product Category’ button in the admin bar.
but it is not!! it is totally a different page.
when I change the page’s slug, it works but it must be the old permalink

any idea/solution please??

https://www.ads-software.com/extend/plugins/wp-e-commerce/