Mario,
Is the scale of the drawing in PlotMaker the same as the view's original scale? You probably have a different output scale than the original scale, and you have the Text set to "Fix Size" (check drawing settings).
DWF export disregards this setting, and always rescales the text according to the output scale. E.g. if original scale is 1:100 and output scale is 1:10 and text is set to fix size, the DWF output will show all text 10 times bigger. This is a bug in PlotMaker.
The workaround is to re-scale the drawing itself. At the end, make sure that all drawing's output scale equals its original scale. (If it is a PMK, open it, select all text, set them 'scaled' in the text settig dialog, then change the drawing scale to the output scale you want)
Gergely Kmethy
VP, Customer Success, Graphisoft