Erratic display of file submissions column when grading assignment

When grading an assignment with upload files, the column "Submissions column" do not always displays the file uploaded correctly. It seem to hide a random student's assignment with each page refresh.

I've reproduce it on Moodle 2.5.3+ and 2.6 using english and standard theme with Chrome (v31) and Firefox (v25).

Firebug don't display any errors in the console.

Prerequisite

• Have a course with a teacher and three students

Steps:

1. Create an assignment with the following options
   • File submission = upload file
     I've tried enabling and disabling the others options and it doesn't change anything. Mine are:
     *feedback = off,
     *require student submit button = false,
     *require student accept submission stat. = yes,
     *attempt reopened = never,
     *no group,
     *simple direct grading
2. Log with each student and submit a file (text file)
3. Log with the teacher
4. Go into the assignment and click "View/grade all submissions"

You should see all the submission as expected. Now if you reload the page by either refresh the browser or use the link in the administration block, you should see the odd behavior in the file submission column.