Jenkins never completed

[yongwoon]

I try to build docker in jenkins, the job is not completed.

[docker ps] In my local,

CONTAINER ID        IMAGE                  COMMAND                  CREATED             STATUS              PORTS                               NAMES
384703c80e00        jenkins_identidock     "/bin/tini -- /usr..."   21 minutes ago      Up 21 minutes       8080/tcp, 9090/tcp, 50000/tcp       jenkins_identidock_run_1
891d004cc2ee        jenkins_identidock     "/bin/tini -- /usr..."   21 minutes ago      Up 21 minutes       8080/tcp, 9090/tcp, 50000/tcp       jenkins_identidock_1
b6a2a4b401b8        redis:3.0              "docker-entrypoint..."   21 minutes ago      Up 21 minutes       6379/tcp                            jenkins_redis_1
6e15694da9ae        amouat/dnmonster:1.0   "npm start"              21 minutes ago      Up 21 minutes       8080/tcp                            jenkins_dnmonster_1
798c8a3a5fab        identijenk             "/bin/tini -- /usr..."   28 minutes ago      Up 29 minutes       0.0.0.0:8080->8080/tcp, 50000/tcp   jenkins

and out of jenkins as following

※ There is no error until the last command executed.

How can I solve it?
And why jenkins_identidock container is generated two?