Calendar fails to render on some browsers

I am using DHTMLX calendar and scheduler, and used to render but switched to a new linux based distro, and now calendar does not render, but sends a box with a listing of the database on Firefox but renders correctly on chrome. Can you folks help?

Hi,

Do you mean minicalendar?
https://docs.dhtmlx.com/scheduler/samples/05_calendar/
If so, please provide more details how to reproduce the issue.