Briefly describe (1-2 sentences) the Bug you’re experiencing: Sometimes, a project will have tasks appear a different project’s calendar but these tasks are not connected to this different project.
Steps to reproduce: We don’t know what’s causing it.
Actually, your first image showing “Content Calendar” is not a Project, it’s a Team, and you’re looking at that Team’s calendar, which is a roll-up of all dated tasks found in any project in that team.
Let me know if you need more details, but I think that explains it.