The problem is:

http://encore.syxe.net redirects to http://encore.syxe.COM/forum/ (this is bad)

When

http://WWW.encore.syxe.net redirects to http://encore.syxe.NET/forum/ (this is good)

This CANNOT be via CPanel because on "Redirects" on CPanel only shows the second redirect which was made AFTER the change of domains... so my guess would be that this can only but modified by .htaccess... but how?

This is my .htacess

RedirectMatch permanent ^/$ http://encore.syxe.net/forum/

Can ANYBODY help me?

You're matching the charactor '/'. When your link doesn't end in / the condition ^/$ is not matched either change ^/$ to ^$ or end all your links in /