Start to Start link not working correctly

When I create a link between two tasks each having 5d duration. The successor task is linked and auto-scheduled but the start date including the time.

Hello Hamza,
I tried to reproduce the issue in the following snippet, but I don’t see anything wrong:
https://files.dhtmlx.com/30d/edc39d0d7a29df99f3f84621d510acc9/vokoscreen-2024-02-15_13-18-03.mp4

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.