Weekly Time Approvals - Sundays and Mondays

We are using Time and Expense entry for collecting employee time. We are also using the Time and Expense Approvals to have the supervisor approve the entries.
When the supervisor opens the list view for the time approvals with grouping on the week, there are conditions where the week appears twice. If the employee works on Sunday we get a week record for the Sunday entry, then another week entry for the rest of the week. While it still lets us approve the time it is annoying.
Does anyone know why Sunday shows as its own week and what we would need to do to correct it?