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Hello @kamakshyap2,
The draft might be deleted by a plugin or a theme which have a schedule to clean such records from the database.
As per example the SG Optimizer plugin have an option “Delete all automatically created post and page drafts” which will perform the operaion once a week and it will be logged into the SG Security activity log.
You can check your active plugins or the theme for such optimization options.
In order to be on the safe side, you can check the IP Address from which the request was made. If this is either the server IP Address or the IP Address of your website it means it is done by the software installed on it.
Best Regards,
Elena