Actual versions of MZpack indicators are shown in 'Indicators - Available' list under 'MZpack/NT8' folder
Also, the version is displayed at the right-bottom corner of the chart. You can turn this label off by unchecking 'General - Version' checkbox.
'Set up - Label' property of indicator contains the name and version of an indicator at the moment when you did add the indicator to this chart. It may contain any text you like and doesn't show the actual version of the indicator. You can edit or clean this text property.