Bad calendar display

[Xrist0ff]

The days are displayed in a list and not in a table :

I use Redmine 5.1. Normal display with default theme. Have you ever seen that ?

[Xrist0ff]

other environnement information:
Environment:
Redmine version 5.1.3.stable
Ruby version 3.2.5-p208 (2024-07-26) [x86_64-linux]
Rails version 6.1.7.8
Environment production
Database adapter SQLServer
Mailer queue ActiveJob::QueueAdapters::AsyncAdapter
Mailer delivery smtp
Redmine settings:
Redmine theme Purplemine2-master (includes JavaScript)
SCM:
Subversion 1.14.2
Mercurial 6.3.2
Bazaar 3.3.2
Git 2.39.2
Filesystem
Redmine plugins:
redmine_kanban 2.3.2

Thank's for you help !