Lovelace UI - text lost after loading custom cards

Hello
When I install a custom card (whatever it is) some texts disappear in UI. The steps

  • directory www created in config/
  • upload of the wanted .js in that directory
  • add the needed url lovelace configuration panel (ressources)
  • reboot server
  • then some texts have disapeared , for example
    • the popup in bootm right that asks if I want to record this connection
    • in the left column, the name of the default dashboard
    • in the top right, the popup menu that propose to edit the UI - just icons, no more texts
    • some texts in buttons in some cards

If I remove the www directory and the ressource line, the reboot the server, it’s still the case
To recover, I have to use a snapshot.

Any idea on how to prevent and fix this ?