Thanks for following up! I guess what happened is a user of your system tried to be funny. In this utterance there are 3 short fully grammatical sentences. And

Thanks for following up! I guess what happened is a user of your system tried to be funny. In this utterance there are 3 short fully grammatical sentences. And a 4th one which is not very grammatical but fully understandable, commanding the device to clean the carpet :) - Cleaning is good. - Dust is so bad. - Make your miracle. - Cleanly my carpet. [1] [1] original is an ungrammatical imperative Some (more) human review would have been needed. The Finnish samples are full of very weird utterances, too. Some like people might have written over 50 years ago, but nobody would speak like this. Maybe they were reviewed on Mechanical turk with moderate requirements / payment? Well, you get what you pay for...