Erroneous links in my URLs - all load the home page -- not a 404 or other error.page

URLs not defined in my urls.py all show my home page and not a 404 missing page error.

For instance 

www.mysite.com  

Naturally shows my home page.

www.mysite.com/catalogs 

Shows the downloadable catalogs

 

then anything goes.

www.mysite.com/thisisanonsenselink

or

www.mysite.com/AnythingTypedHere

Shows my homepage

Why isn't my project issuing 404 or other errors when page not found?

Please advise 

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