It works fine for first creation, then it keeps logging in as the previous user in drupal. Please help

I am using drupal 5.19. After installing FBConnect, i tried them all including the dev release, it works fine for the first time. I was able to register and import from facebook. After logging out, I tried to connect with a different facebook account. After connecting, it brings me to that previous users account. I thought it was my browser, so i cleared cookies and cache, still same issue. I even clear cash in my database.. same problem... my caching is disabled in drupal settings. Also tried from another computer with a different ip and it still logs in as the previous user of facebook... i disabled the module until someone can help me out...