Yahoo Slurp Crawling Wrong URLs

[webmktg]

Yahoo slurp is crawling my website daily. Unfortunately slurp is crawling most of my URLS partially in other words it is crawling wrong urls.

For example Yahoo slurp is crawling www.webmasterworldebsite.com/destination-guide.html as www.webmasterworldebsite.com/des

Some of my pages have got listed in Yahoo. Some of the pages listed with correct URLs and some with wrong urls.

Don’t know whether I’m doing something wrong or is this how Yahoo slurp is crawling websites? Please advice.