Site Redirecting issue

I have a domain name (ex-dmt2.be) which redirects to another domain (ex-dmt2.weebly.com) which is used by a third party to maintain and update the contents.
A funny thing happens:
When I type "http://ex-dmt2.be" in the URL bar on my Opera browser the third party site is shown as expected.
However when I type "http://www.ex-dmt2.be" the redirect is not performed and a default panel is shown.

In the DirectAdmin section of the backoffice I have added a Site Redirection entry.
The local URL Path which is shown is "ex-dmt2.be" hence the correct redirection is performed when typing http://ex-dmt2.be.
However as this Local URL Path is protected it is not possible to add a redirect entry for "www.ex-dmt2.be" which also should be possible.

Can you please advise?

I have a domain name (ex-dmt2.be) which redirects to another domain (ex-dmt2.weebly.com)

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It's even a redirection from a domain to a subdomain on another domain.

Did you fix it already? Because if I visit http://www.ex-dmt2.be with my browsers, I -am- redirected to the weebly.com domain so it's working correctly. This is with Chrome and with Firefox.

So either you fixed it already, or your Chrome is using some old cache.