Pipelines output is screwed up - command logs are all mixed up

+ docker version
Client:
 Version:	17.12.0-ce
 API version:	1.35
 Go version:	go1.9.2
 Git commit:	c97c6d6
 Built:	Wed Dec 27 20:05:38 2017
 OS/Arch:	linux/amd64

Server:
 Engine:
  Version:	17.12.0-ce
  API version:	1.35 (minimum version 1.12)
  Go version:	go1.9.2
  Git commit:	c97c6d6
  Built:	Wed Dec 27 20:12:29 2017
  OS/Arch:	linux/amd64
  Experimental:	false

+ echo $0
/opt/atlassian/pipelines/agent/tmp/bashScript4349949088269326671.sh

+ which mvn
/usr/bin/mvn

+ mvn -s ./maven-basic/settings.xml clean deploy -B -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer=warn
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO] 
[INFO] docker-ci-parent
[INFO] maven-basic
[INFO] maven-install4j
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building docker-ci-parent 1.0.2-SNAPSHOT
[INFO] ------------------------------------------------------------------------