Prices in Product Detail page changes after register/login or checkout as guest

[sanjay1970]

Ok All here is my situation, when ever I register/login or checkout as guest the prices in my Product detail page changes, ie: if just say one of the product is $450, after register/login or checkout as guest and i return to the product detail page is show $508.50, and also show the tax $58.50, is this normal and if not how can I have the original prices display when login or checkout as guest?

Thanks to all