Duplicate URLs to same pages

[angel]

I have some duplicate URLs coming up for pages coming up.

 

The original URL is:

http://www.datingskillsreview.com/review/membership-programs/293-Sex-God-Method-VIP-Program-Daniel-Rose

 

Another one that is accessible for the same page is:

http://www.datingskillsreview.com/review/293/293

 

This doesn't seem to happen for all products - is there any known reason why this would be happening?

 

Thanks.

[Alejandro]

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