● There could be several reasons why this thing occurs. First, it could be that your flour was exposed to moisture before you used it. Or, you put more water into your dough than what is deemed necessary.
● This could also happen if your chamber, mixing paddle and accessories were not cleaned properly or were still wet when you placed your dough mixture into it.
● There could also be a lot of leftovers inside the dough chamber if the water is not poured in the right order while you were still making the dough. Or, the flour type you used is different from what’s recommended.