Subfolder Redirect

My sites are all in sub-folders, and when I type in the url, each sub-site is always redirected to the main site. Once it’s been redirected, I am able to type the sub folder on the end of the already loaded url, and it will load the proper page. For instance, I will type in http://www.examplesite.com/site1, and it will redirect to http://www.examplesite.com. Once that is loaded I can go back to the url and add /site1. Only then will the browser actually load examplesite.com/site1. I’ve tried in IE, Chrome, Firefox, and Safari. The same thing happens every time. Multisite works perfectly in every other respect. I enabled it through the server company when I installed WordPress to begin with.