Tooltip Wrong data popping

I’m facing an issue related to Gantt chart API, tooltip Marker, when I am placing my marker on task bar in the chart, the tool tip pop up’s and the dats shows on the tooltip pop is incorrect (start date, End date, Task ID end date is showing by adding 2 days to the original) from the original Record values. I am using the charts in Salesforce. Can any one please suggest me what should I do or how to solve the issue

Hello Mandadapu,
I couldn’t reproduce the issue in the following snippet:

Probably, the issue is related to the Gantt configuration, but it is hard to suggest what might be wrong as I don’t see your code.
Please add your configuration to the following snippet and make sure that the issue is reproduced there:

Then, click on the Save button and send me the link.
Or send me a ready demo with all the necessary JavaScript and CSS files so that I can reproduce the issue locally.