The answer to 'why is my surge protector circuit overload' is that your surge protector is drawing more electrical current than it's designed to handle. This can happen if you have too many high-power devices plugged into the surge protector, or if one of the devices is malfunctioning and drawing excessive power.
Common symptoms of a surge protector circuit overload include the surge protector's circuit breaker tripping, the power outlets not working, or the surge protector getting hot to the touch. To resolve this, you'll need to unplug some devices, make sure all your devices are working properly, and potentially replace the surge protector if it's old or damaged.