For onboarded traits from Marketo, the audience size has became 0 and it is affecting the segment made using those traits. So what could be the reason behind this and how can I increase the size of traits so that eventually my segment size can increase?

Hi, I am new with AAM and struggling with Predictive Audience, I have created a few PA but in all of them real time audience is not evenly distributed in the created segments. First segment is very populated then the rest have very very less value, some even have 0 audience. Can anyone tell me the r...