CAD lines to room separation lines has unexpected result?

[jacob.small]

This is element bindings play. @Daan was close with his suggested searches. This post and the AU session I linked likely contain everything you need to know about the topic.

Element Binding in Revit

Element binding is the name given to the process which Dynamo manage to ‘track’ the items created in non-Dynamo files. In this case, I’m going to focus entirely on element binding as it refers to Dynamo for Revit, but the mechanism exists to allow for this behavior in other applications (advanced steel, fusion, alias, etc.) as well. In the context of Revit, ‘elements’ refers to anything with an Element ID in the Revit database. When utilized correctly, element binding will expand how you leverag…

Effectively if you haven’t cleared the bindings before moving to Dynamo player the binding behavior will persist. The easiest way to do this is to delete the bindings section of the DYN file in a text editor. Another option is to replace the nodes which make the Revit elements, then save without running the graph.