Bug-Fixing, Troubleshooting

Hi. Before you read the project, take into consideration my budget for this is $40 USD. I own a small Online Gaming Community that hosts a web browser game called 2moons. 2moons is an OpenSource clone of popular browser game Ogame. I have been running this community for 1.5 years now, so its not a new project. I require a person who has previous experience with PHP web browser games and knows how to work around it. What I need is somebody with good skills of PHP, MySQL and Javascript to troubleshoot and fix some bugs I have in the game. Mainly, I have a problem in communication between PHP and MySQLi where MySQL doubles entries in the DB, giving unfair advantage to some players over others, and people have learned how to mask this and keep double profits. This is the most important issue and I need it patched ASAP. Other problem is one of my PayPal script is not completely working and it needs to be fixed, as well as I need hardening of the PayPal script secuirty. I am looking for someone who will dedicate their time and work on fixing the above. You can check one of the game versions I have here: [login to view URL] My Budget is 40 USD / 30 EUR or preferably less, depending on how much you can understand the issue and how fast you can fix it. I am looking forward to your bids and looking forward working with some of you on this.