We have a website where a node can have multiple parents. The first parent is the main category of a product, while the second parent is the brand of the product. With certain nodes we get a strange menu behaviour after selecting the second parent.

When selecting the first parent and adding it to the menu, everything works as expected. After adding a second parent (the brand node in this case) we experience several inconsistencies.

  • when viewing our node the brand menu-item gets an active trail, instead of the category
  • the breadcrumb trail is as expected (home -> category -> product)
  • This only happens with a few nodes, while there is no difference between those nodes

Any idea what might cause this behaviour?