Shared user can't see certain records

Shared user can't see certain records

Hi I have a shared spreadsheet with two other read/write access users.  In the spreadsheet, there is a sheet that is data entry sheet that one of the user inputs data (we will call her User A).  Few days ago, User A all the sudden could not see any data above a certain row (but can see row 1 which is the header row) that she inputted.  The rows were not hidden or filtered.  However, when the data is copied over to a later row in the sheet, user A can see it.  User B (the other user with Read Write access) had similar issue at the same time, but after a day or two it went away and User B can now see everything back to normal.  Owner of the spreadsheet had no issues seeing all of the data.  User A still has the same issue.  Can someone help me resolve this issue?