Hosting multiple sites on the same hosting account. Getting a weird redirect

[strungoutyeh]

I have about 5 sites all hosted on my same hosting account. One of those domains is attached to the hosting account. I place my other domains in a folder of a sub-directory of my main domain. This has been working fine, up until today when i noticed a weird error. Ill give you a little example of how my sites are setup

my main domain:
www.maindomain.com

My other sites hosted in a sub-directory of my main domain:
www.maindomain.com/sites/site2/
www.maindomain.com/sites/site3/

How my other sites appear on the web:
www.site2.com
www.site3.com


This works fine for every page until i go to www.site2.com/index.php
It redirects to www.maindomain.com/sites/site2/index.php for some reason


Anyone know what couldb e causing this and how i can fix it?

[SiberForum]

Check htaccess file. Also that is really useful to ask the web hosting provider to check that