What type of conflicts occur between the Project Manager & the Lower management staff during a project?

Arguments about scope are very common when the project gets under pressure, positive thinking turns into cutting corners to meet a budget or deadline.

Another classic is the 'you should have involved us earlier' discussion, often it's true that more people should have been involved at early stages, sometimes it's purely a hindsight bias.

knowledge, when the lower management staff  do not have sufficient knowlege on the project, and the project is over budget.