Roisin,
The same applies, a shift is just another way to dice up time. Look at the workgroup configuration, on the ACD tab, at the shift start times. This is saying 60 interactions (or thereabouts!) were "carried over" from the previous shift.
Take a look at the previous shift statistics and you will probably see that the numbers don't match and it's a common concern.
What you should find is that the number of interactions at the start of the interval + the number arriving should equal the number left at the end + the number answered + the number abandoned.