Dashboard feed history doesn't match

Dashboard feed history doesn't match

When viewing the Dashboard "Feed" on a project, another manager and I don't see the same history.  When she looks at the "Feed" on this project, notes go  much further back than my "Feed" view does.  My feed only went back to April 22, 2016 to start with.  Then I clicked around and the only thing we can come up with is that I opened the calendar which goes much further back and when I went back to the Feed I had information all the way back to March 25th.  The project goes much further back than that but my feed doesn't show it.

What is the problem?