Suddenly Many 301 Redirects captured by SEOMOZ

[noerdar]

On April the 7th SeoMOZ captured 6000 301 redirect on my site, but I cant seem to understand how SEOMOZ finds these links

Example

http://www.iphonegadget.dk/dk/apple-tilbeh-r-36/ipad-tilbeh-r-219/bilholder-239/index-2-4a.html

Makes a 301 Redirect to the following page beneath SEOMOZ says

http://www.iphonegadget.dk/dk/apple-tilbeh-r-36/ipad-tilbeh-r-219/bilholder-239/index-2.html

The weird thing is that both urls work, but if i browse my site in a normal matter this link will never be created i that way. The -4a in the end os the link is not the normal link structure on the site and has never been like that before. So how does SEOMOZ Create that link?

http://www.iphonegadget.dk/dk/apple-tilbeh-r-36/ipad-tilbeh-r-219/bilholder-239/index-2-4a.html

Also google only has the right one that are this one beneath

http://www.iphonegadget.dk/dk/apple-tilbeh-r-36/ipad-tilbeh-r-219/bilholder-239/index-2.html

People would normal come to the category with this url

http://www.iphonegadget.dk/dk/apple-tilbeh-r-36/ipad-tilbeh-r-219/bilholder-239/

And page 2 would be

http://www.iphonegadget.dk/dk/apple-tilbeh-r-36/ipad-tilbeh-r-219/bilholder-239/index-2.html

AND NOT

http://www.iphonegadget.dk/dk/apple-tilbeh-r-36/ipad-tilbeh-r-219/bilholder-239/index-2-4a.html

Can anyone find out what is going on?

[noerdar]

I found the problem it was my sort function