That would explain it - version 2.2.4 had a bug which appeared due to some refactoring which caused only one curve from a polycurve to be output (although, all curves are still converted) by the node. The reason why you get all the expected Detail Lines is because element creation in Revit is controlled by a transaction declared within the node which is committed to your document once it executes (i.e. its effectively a separate process from Dynamo).
The issue was fixed in BimorphNodes v2.2.5 - if you upgrade to the latest version on the package manager (v2.2.7) all will work as expected.