Hi @Steven_Corliss1, welcome to the Asana Community Forum! This is currently working as expected and it’s not a bug. As it stands, it’s currently not possible to prevent dependencies from being complete, if you try to mark dependencies complete from List view or your My Tasks you will receive a warning indicating the task is still waiting for another task. This is something we hope to implement in the future.
We have a thread in our #productfeedback category requesting this feature, you can upvote here: Prevent dependencies from being marked complete