Actual versions of MZpack indicators are shown in 'Indicators - Available' list under 'MZpack/NT8' folder

Also, version is displayed at right-bottom corner of the chart. You can turn this label off by unchecking 'General - Version' checkbox.

'Set up - Label' property of indicator contains name and version of indicator at the moment when you did add indicator to this chart. 

It may contain any text you like and don't show actual version of the indicator. You can edit or clean this text property.