OScommerce-fix Login/Shopping Cart/Items problems

OSCommerce Sessions Fix I am trying to install a pre-built OsCommerce website hosted in [login to view URL] . I have the following problem: 1. Users are sometimes fill out email and pw in the login page, hit the Login button and they are brought back to HomePage. 2. The shopping cart remembers items in the basket after they have been deleted, and frequently - when users do get to the checkout stage (delivery or payment) they are returned to the login page and asked to submit their details. 3. When customers login successfully, sometimes when they click the icon Shopping Cart on the top-right of the homepage, the cart shows something different than when they click the icon Items [] (also in the top-left of the homepage. (The Items should be the items the customers have in their cart). I require an expert in OSCommerce and PHP. If you do not have a track record in either, then do not bid. I prefer someone who has fixed these problems before. Since I saw several projects similar to this posted here, I expect that it is a common problem and should not take more than 2 hours to fix it. As an amateur, my budget is tight, so I will pay up to 60 USD. The first bidder that meets our requirements and bid 50 USD will be selected, and we will close the auction early. Regards, Nguyen Nguyen