Australia Sg D122 - Help On Cancel

Hello everyone!
I have this stamp, an SG D122, but I would like your help. Apparently there are several printing problems, the colors invade the design and some lines were not printed. But what catches my attention the most is the manual cancellation. The ink does not seem to have been applied directly to the stamp, but rather to the printing. The cancellation ink seems to have been applied in relief, it seems to preserve the space between the lines.
What do you think? Any comments are welcome

It looks like a typical pen/pencil/marker cancel that is applied to many different revenue stamps. It actually makes it less desirable than a machine cancel. Keep them coming.

I would not read too much into the pattern of the manuscript. It looks like a felt tip pen was used and very little pressure applied.

Thanks for the comments.