Reply To: MS Project 2013 Activities rearranging their placement in the schedule

[Daryl Deffler]

Cheryl;
Do the tasks have the same task ID numbers, but are simply displaying in a different order?

I don’t know that this will fix the issue, but check the view that is initially displayed when the schedule is opened. For example, does it have a Filter or some Grouping parameter specified? Is that view an out-of-the-box view that you can’t modify, meaning changes you make to it will not be saved?
Just some thoughts