Weird redirecting when entering non-www url

Hope someone can help me with this!

I have an new instance of wp installed in /alamedahomesforsale (subdirectory). This is a godaddy account with another wp install in the root, and other wp installs in sister subdirectories. They have all been upgraded to 2.9.2 and are working correctly .

I’m experiencing 2 problems after completing the install with no issues. Thesis theme is installed, but I’ve verified that the same issues are happening without it as well:

First issue
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When I type in https://alamedahomesforsale.net, it redirects me to https://www.alamedahomesforsale.net/alamedahomesforsale and displays the home page. Typing in https://www.alamedahomesforsale.net brings up the home page as expected.

Second issue
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When I type in junk after the url, e.g. https://www.alamedahomesforsale.net/isdhflsadhf, it just displays the home page instead of the standard 404 error message

I’ve reinstalled again (both wp and the database), and am still getting the same issues. Am wondering if it’s something else that I’m not seeing. I have other wp instances installed in sister directories that are all working fine, and have compared various config parameters and they all look the same. I have also entered the following in the .htaccess root file `rewritecond %{http_host} ^alamedahomesforsale.net [nc]
rewriterule ^(.*)$ http\:\/\/www\.alamedahomesforsale\.net/$1 [l,r=301]` but it doesn’t seem to make any difference.

Appreciate any and all suggestions. Thanks.

Ben.