Incorrect log field display

From Kibana, I display the following line into log field
2019-06-13T07:32:25.125920106Z stdout F {"time":"2019-06-13 07:32:25,125","log-level":"INFO" ...}
but I want display only {"time":"2019-06-13 07:32:25,125","log-level":"INFO" ...}, because my application print this on stdout. How can I resolve the problem?