Redmine

When i want to add users to my project the userlist looks like this:

My Environment is:

Environment:
  Redmine version                2.4.2.stable
  Ruby version                   1.9.3-p0 (2011-10-30) [x86_64-linux]
  Rails version                  3.2.17
  Environment                    production
  Database adapter               PostgreSQL
SCM:
  Subversion                     1.6.17
  Mercurial                      2.0.2
  Git                            1.7.9.5
  Filesystem                     
Redmine plugins:
  gantt_menu_link                0.1.1
  planner                        0.4
  progressive_projects_list      1.0.0
  redmine_agile                  1.3.1
  redmine_app__space             1.0.1
  redmine_ckeditor               1.0.16
  redmine_code_review            0.6.3
  redmine_contacts               3.2.15-light
  redmine_contacts_invoices      3.1.2-light
  redmine_finance                1.0.9-light
  redmine_issue_checklist        2.0.7
  redmine_issue_detailed_tabs_time 0.1.0
  redmine_issue_templates        0.0.8
  redmine_latex_mathjax          0.1.0
  redmine_local_avatars          0.1.1
  redmine_planning               0.7.6
  redmine_plugin_views_revisions 0.0.1
  redmine_timesheet_plugin       0.7.0
  redmine_tweaks                 0.4.5
  redmine_watcher_groups         1.0.1
  redmine_wiki_backlinks         0.0.2
  redmine_wiki_extensions        0.6.4
  redmine_wiki_lists             0.0.3
  redmine_wiki_toc               0.0.4
  redmine_wiki_unc               0.0.3
  wiking                         1.0.0b

I think it has to do with the column widht?!
But i dont know how to change it and didnt found explanations...
(I looked at application.css, members_helper and app/views/project/settings/_members.html.erb, but I'm not good at ruby or html-stuff)

Do you know how to fix it? - Would be very nice!