The answer to 'why is my light fixture burning smell' is that a burning smell from a light fixture is usually a sign of an electrical problem that requires immediate attention. This could be caused by a variety of issues, such as a loose connection, a wiring problem, a malfunctioning component, or an overloaded circuit.
Some common symptoms of a burning light fixture include a strong, unpleasant odor, smoke, or sparks. If you notice any of these, it's important to turn off the power to the fixture right away and investigate the cause. Attempting to troubleshoot or repair the issue yourself can be dangerous, so it's generally best to call a licensed electrician to diagnose and fix the problem.