You are seeing some events with blank fields for reg_value_result while other times it is filled.
The Integrated Defense Exchange software is just passing along the data it receives from DCS itself. These items are also blank in the DCS database:
Old/New Values: /
Old/New Values: / 0
Release : 1.4
Component : DCS collector
The Integrated Cyber Defense Exchange (ICDx) software is working as designed and is passing along the data that it is receiving from DCS.