Url without / At the end

Hi there,

I have a wordpress website http://www.corecapacities.com.
I recently found out that my wordpress website do not redirect my links that are without / at the end of the url.

For example, if you click on the "contact us" in the footer, it shows a blank white page. However, if you edit the url and place in / at the end of the url, it links to my contact page (which is correct).

Any ideas why this happen? I never had this problem before.

Thanks in advance