Mapping Policy behaviour

I’m trying to create a chatbot that uses only Mapping Policy. For every intent I put a trigger, but in some case the system triggers Action Listen with confidence 0 instead of the the action that it is supposed to trigger. I’m also testing this bot with another bot, if I keep sending messages at a certain point it starts selecting Action Listen with confidence 1 for some interactions and then it goes back to work normally.

How is this possible?

Please, can I have some help @akelad?