Hi,
there is no coordinate system transformation or recalculation in Penmap.
To correct your data you can use Penmap Project Manager and download the nodes as csv. Pick the format "P,Lat,Lon,Elv,C". The coordinates are exported as WGS84 coordinates then.

Create a new project with the correct zone and import the csv-file selecting the lat/Lon-format.
Hope this helps
Cornelia