model dependency diagram not updating

Say i have generated 3 models and each have a migration xxxcreate_model1, xxxcreate_model2, xxx_create_model3.  When i migrate down xxxcreate_model2, it drops that table.  If I migrate down xxxcreate_model1, it also drops that table.  These changes are shown in the Model Dependency Diagram.

However, if I migrate down xxxcreate_model3, it drops that table and my version number is now 0, but the Model Dependency Diagram Doesnt reflect this.  It shows all 3 tables filled with their attributes.  I should have 0 tables right? Or is this normal?