question in regarding to resolution of domain name

Hi Guys,

Just a quick question, i don't know if this is because of pro-site plugin or the setup wp multi site. The problem is this:

Case 1. http://www.abc.com - resolves correctly to the main site.
Case 2. http://abc.com - resolves to http://www.abc.com/prosite/?action=new_blog
Case 3. http://anything.abc.com - resolves to /prosite too (if there isnt blog named anything)

Shouldn't Case 2 & 3 resolve back into the main site instead of /prosite?

In my DNS editor:

abc.com.	    14400  IN  A             123.345.66
http://www.abc.com.  14400  IN  CNAME  abc.com
*.abc.com          14400  IN  A             123.345.66

Any thoughts?