Redmine

When editing the issue, fields are displayed for modification in "Change properties" area.
In the area, "Start date" and "Due date" have string-fields and there are Icons for Datepicker right of the string-fields normally.

But, if an issue status is changed to another status the datepicker icons disappear.

I already changed the Theme for Redmine to the standard Theme but I still get the same error. When I tried another browser (for example Firefox) the Issue is not Appearing.

Redmine configuration (from "Information" of "Redmine") are as follows.

• production system: Linux based
  

  Environment:
    Redmine version                4.0.2.stable
    Ruby version                   2.6.2-p47 (2019-03-13) [x86_64-linux]
    Rails version                  5.2.2
    Environment                    production
    Database adapter               Mysql2
    Mailer queue                   ActiveJob::QueueAdapters::AsyncAdapter
    Mailer delivery                smtp
  SCM:
    Git                            2.14.1
    Filesystem                     
  Redmine plugins:
    redmine_agile                  1.4.8
    redmine_checklists             3.1.14
    redmine_contacts               4.2.3
    redmine_contacts_helpdesk      4.0.2
    redmine_dmsf                   2.0.0
    redmine_people                 1.4.0
    redmine_zenedit                1.0.2
  

Could you please provide me help to fix the Issue