weird grunt noise

I've encountered the most ridiculous of problems. When i input an G flat note followed by an E flat note, in the E flat clarinet, the G flat note sounds as if the read splits, and its followed on the E flat note by a sound which sound like a person saying "eugh". The key signature is D flat major, I'm unsure of weather that information is relevant, but if anyone would like to try it themselves, I'd assume you'd want to try to replicate the context also. Thank you!