I am also facing the same issue with Sonar-Gerrit jenkins plugin. Downloaded it from Jenkins plugins site.Using Sonar-Gerrit plugin 2.2.1, and analysing sonar scan against jenkins workspace.
For a sample,have changed just one file and provided the project base directory to the path of that file, and ran the sonar analysis in issues mode.
Issues are not loaded in Gerrit and jenkins logs say
Report has loaded and contains 759 issues Issues to be commented: 0 Issues to be involved in score calculation: 0 Review has been sent
Have already referred the StackOverflow Page Sonar Gerrit plugin not reporting results. Kindly advice on this