The only two things that can cause the skimmer itself to overflow is a blockage in the output, air intake, and/or debris caught in the pinwheel. Overflowing skimmer is more to do with your water than the skimmer itself. If this happened after feeding, most likely it is the food that changed the surface tension of the water. If the system is new you can also be experiencing a mild bacteria bloom which can also attribute to excessive air.