URL Redirect Help

Hello,

I am a total novice to the URL rewrite module. I have however been using it over the last week and have found it very good. I am just not 100% sure I am using it correctly.

We have used the module to implement friendlier URL's on the site which appears to work really well. We have also redirected some old URL's to the new friendlier ones. However our duplicate title tags in Webmaster Tools has considerably increased since doing this. I have put below two examples from the duplicate title tags that we see in our webmaster tools.

Example 1

http://www.pooltablesonline.co.uk/proddetail.asp?prod=avant-garde-pool-dining-table-walnut
http://www.pooltablesonline.co.uk/proddetail.asp?prod=avant_garde_slate_bed_pool_dining_table_walnut

Both the above URL links 301 redirect to the following new friendlier URL: http://www.pooltablesonline.co.uk/avant-garde-pool-dining-table-walnut

Is there a reason why this would show as duplication in webmaster tools?

Example 2

http://www.pooltablesonline.co.uk/proddetail.asp?prod=chrome-blue-pool-lighting-set

http://www.pooltablesonline.co.uk/chrome-blue-pool-lighting-set

Both the above links 301 redirect to - http://www.pooltablesonline.co.uk/chrome-blue-pool-lighting-set

I am very new and inexperienced to this module and would appreciate some advice or reassurance that I have implemented these rules correctly as I do not want lots of duplication in Webmaster tools.

Kind Regards

David