Child table Data not saving

While saving - Parent data is saved, child table data cleared before saving. ?
In frappe cloud, in local its working fine.

It only happens when someone applies the server/client script or when there is some validation, so please check it on your side. And your details are not enough to solve your issue!

there is no validation applied for the child table, the child table cleared before saving. In my local system, able to save and perform all the functionality.

is any issue for using the same child table multiple times in doctype ?