@andrew.ridgeley,
We have tested your source VSDM drawing with the latest version 17.7 of Aspose.Diagram for .NET API and managed to replicate the issues as below:
This is the output SVG: Services Bid_17.7.zip (5.1 KB)
DIAGRAMNET-51329: VSDM to SVG - the line breaks are not preserved
DIAGRAMNET-51330: VSDM to SVG - an additional watermark text is added
We have linked your post to these tickets and will keep you informed regarding any available updates. We are sorry for the inconvenience caused.
Best Regards,
Imran Rafique