Redmine

I just do a redmine migration from 2.4.2 to redmine 3.1 on a new server working on Debian Jessie.

Migration as done correctly.

When I create a new demand, All of my "Description Message" and "Subject" are cleared when I change "Status" of this Issue -> Status go to New, and Subject and Description text area go to empty, like a new issue.
This append the first time only, if i redo a change of status, everything is ok.

If i try to create a new issue, same problem.
If i go to a issue and i try to change Status, first time it doesn't work, second time OK...

I'm running under Debian Jessie with apache+passenger

Environment:
  Redmine version                3.1.0.stable
  Ruby version                   2.1.5-p273 (2014-11-13) [x86_64-linux-gnu]
  Rails version                  4.2.3
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.8.10
  Filesystem                     
Redmine plugins:
  no plugin installed