[Merging Label confused]

I am trying to print address labels 4 up on a sheet (each address is
different) they are coming in from a merge file. I keep getting the
addresses to appear in a different location on each label every time. Some
appear higher on the label and others appear lower on the label, I have tried
to use textboxes so that the address would not shift unto a different place
on the label, but that has not worked out. Any advice ???