$ProjectRevision label

While using MKS integrity client, we are embedding the $ProjectRevision label to populate the firmware version. However, this label seems to change based on project state (or sandbox). On most machines the label expands to "$ProjectRevision: Last Checkpoint: 1.59 $": however, on one machine it infrequently shows "$ProjectRevision: 1.59 $".

While it's easy to change the parser to deal with both cases, please could you explain what the difference is?