Paddle/Bike

Has anyone experienced an odd smell when they first start the engine? It is brief, but smelly. The dealer changed the cabin filter at my 5000 mile service. but that didn't resolve the issue. It's very strange. I thought it smelled like stinky shoes, but friends say its electrical. It just started at around 4000 miles. The car is garaged. Its not mildew odor. Just curious. I've never owned a hybrid so I don't know if this is normal. Thanks for any feedback.