Bug Fix Modification Needed

Several parts of my existing application are misbehaving and I need them put right quickly. The scope is strictly about bug fixes—no design revamp or feature work for now. I will provide direct access to the current codebase, a short video that shows the misbehaviour, and the most recent error logs... (Budget: $10 - $30 USD, Jobs: API, Debugging, HTML5, JavaScript, Node.js, PHP, Software Development, Software Testing)