How to deal with bugs which cause URL Truncation

I am a working on a website for a leisure portal company in Germany. I am having trouble dealing with a truncated url. If you were to go to the web link http://www.regiondo.de/staedte/duesseldorf/lernen-unterricht-duesseldorf/musikkurse-duesseldorf , on the left side of the screen under KATEGORIEN, you would see Gitarrenunterricht (1).

If you click on it, the user is redirected and gets a 404 page not found error, since the actual url to where the user is supposed to redirected is http://www.regiondo.de/staedte/duesseldorf/lernen-unterricht-duesseldorf/musikkurse-duesseldorf/gitarrenunterricht-duesseldorf , is truncated and 'duesseldorf' at the end of the url truncates to just duessel

Now I have looked at the HTML code for the webpage and it has the specific code:-

a href=/staedte/duesseldorf/lernen-unterricht-duesseldorf/musikkurse-duesseldorf/gitarrenunterricht-duessel>Gitarrenunterricht (1) 

Now I understand that by changing duessel to duesseldorf I can rectify this issue but this url truncation inside the HTML is happening for many other urls as well(all of which were knowingly typed correctly). What are the possible problems or bugs from the backend which could cause such URL truncation problems. Si开发者_如何学运维nce I am new to web development I would love to hear your suggestions and views. Thank you.

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In your Magento build set the products to not use the category name in the URLs. Then the problem goes away.

http://www.example.com/index.php/admin/system_config/edit/section/catalog/

Then in Search Engine Optimisations section:

Use Categories Path for Product URLs -> No