Hello
If the bars are not rendering correctly, it may be due to a few potential reasons.
Ensure that the data you are passing to the Gantt component is in the correct format. Each task should have the necessary properties, such as id, start. end and duration parameters are optional but you should specify either the end date or duration not both. If you don't specify any of them, the bars will not be rendered.
Also make sure that the start and end dates of your tasks are valid and fall within the overall date range of the Gantt chart. If the tasks are outside the visible range, they may not render.
Sometimes, custom CSS styles can inadvertently hide the bars. Inspect the elements in your browser's developer tools to see if any styles are affecting their visibility.