Please send us a demo, so we can work on it and resolve the problem.
In the demo, you may leave the data empty to be easier for you.
Send it here: support@jqwidets.com

Alternatively, you can copy everything related to the gantt, definition, css, and code related to gantt.
But I think it will be easier with a demo.

We are looking forward to hearing from you!

Best Regards,
Svetoslav Borislavov

Smart UI Team