Queries :: Display Empty Rows For Missing Data

I'm trying to make a sub form that displays the hours of an employee selected in a listbox. I've got most of it working but having a bit of an issue.

The info for thre query is in 3 tables:
tblStaff (name etc)
tblShifts (start and end times for days that this employee works)
tblDays (a list of days names so I can use numbers elsewhere)

My query looks like this:

Code:
SELECT tblDays.dayName, IIf(Nz([startTime],"")="","NWD",[startTime]) AS start, IIf(Nz([endTime],"")="","NWD",[endTime]) AS [end], tblStaff.staffName
FROM tblDays LEFT JOIN (tblStaff RIGHT JOIN tblShifts ON tblStaff.staffPK = tblShifts.staffFK) ON tblDays.dayPK = tblShifts.workingDay
WHERE (((tblStaff.staffName)=[Forms]![frmMain]![lst_myTeam] Or (tblStaff.staffName) Is Null));

This worked fine with a single user and some test data - it correctly displayed all days of the week, with start/end times on Mon and Tues where I had entered shift information, and "NWD" against all other days.

However, when I add a couple more employees to the mix it shows the correct info for the first employee, but anybody else it will only display days where person 1 doesn't have any hours. I haven't entered any hours for the new employees, but the query should still display Mon-Sun with NWD in every column. It shows Wed-Sun but Mon and Tues are missing.

I've tried different join types but they all come back with "ambiguous joins" error when I try to run.