That shouldn't be happening. How much product are you grinding? I'm guessing you are running it with too little product. Try running a larger batch and see if that resolves your issue. We have tried many of those melangers at the eGullet workshop and they do a great job.
Also, I think that the micro batch kit bowl and stones would work on your grinder model. If they do, you could work with small amounts and not have splattering issues.