If you take a look at the screenshot, you'll see liquorice dispensers in the middle. If you've played Candy Crush before, you'll know that liquorice is annoying and serves no purpose other than to hinder you.
Is it possible to tell when it going to dispense the liquorice (or whatever item the dispenser is designated to dispense such as ingredients, bombs, etc.)? I can't distinguish if there is a pattern they follow or not. It seems to me that it is random.