sonar-scalastyle result not showing in github

[kknd22]

First, this plugin works nice in our sonar 5.6 LTS.
Using the sonar plugin https://docs.sonarqube.org/display/PLUG/GitHub+Plugin
I was able to push java sonar result to the github pull request, however, all scala results are missing.

Sonar claimed their plugin is language agnostic. Anyone has any clue why scala static code analysis results are missing in the github Pull request, while java counter part are good?
Thanks
-cl