Question:

Vault manages eSignatures with the eSignature object class to capture eSignatures on object records. When a user provides an eSignature, Vault creates a related eSignature object record with the Signature Time field. However, this field is not sorted correctly. What is the cause?

Answer:

The data grid is sorted by field type. Since the Signature Time is a Text field, it is sorted by the literal String value, not the DateTime.

The Signature Time just captures what the user experienced and is not a timestamp. The user should sort by the Create Date to get proper sorting. 

Related Documentation:

Vault Help Documentation: Managing Object eSignatures