Next Run Date Column Not Sorting

We've just installed SQL Server 2000 on one of our servers and have
noticed a strange behavior. When clicking the column headings in the
job display in Enterprise Manager, the list is sorted (first click
ascending, then descending) on the column clicked except for "Next Run
Date." When we click on "Next Run Date," the list is reordered, but
randomly. Each time we click it we get a different order but never
ascending or descending. This is true whether we're at the server or
on a remote machine. We never saw this behavior with SQL Server 7.0.

Any ideas? Thanks!