Why do my Resources have different Project Start Dates in Team Planner ?

[AmmeLane]

Dear MS office forum community



Help Help Help me please

I have created a projects portfolio overall plan in MS project 2010 professional. I have 23 lines with 23 project titles, start and end dates, associated resources. Some project dates were manually entered some dates where determined automatically.

I have been looking at the Team planner view to check concurrent project involvement for each member of my team, in order to check overallocation.

I picked up that some resources get involved earlier or later on projects which is weird as I gave them the same % of involvement ?

How can I remediate to this and see all resources start and finish on common projects at the same time ?