The plugin contains tabular markup on some form elements or uses HTML selectors in form JS code and will probably present issues with the tables-to-divs changes in https://issues.jenkins-ci.org/browse/JENKINS-62437

At least the following files may be affected:

• https://github.com/jenkinsci/matrix-reloaded-plugin/blob/master/src/main/resources/net/praqma/jenkins/plugin/reloaded/MatrixReloadedAction/index.jelly

Some migration recipes can be found on https://www.jenkins.io/doc/developer/views/table-to-div-migration/