Its about bug

Warhammer 40,000: Darktide Technical Support
4

If you haven’t already, please could you use the ‘Verify Integrity of Game Files’ option via the Steam client?:

  1. Right-click Darktide in your Steam library sidebar
  2. Select ‘Properties’
  3. Select the ‘Local Files’ tab
  4. Select the ‘Verify Integrity of Game Files’ button
  5. When complete, close and reopen Steam