Labels don't always match up perfectly, especially those little return address labels.
What can you do, besides prayer and fasting, and wasting labels?
I try to just give the labels some room to make mistakes without screwing up my text, by putting some space around the label text. It's nothing all that complicated, but I hate to think of dealing with labels without it.
Next, select the upper left label and make the font as small as you need to to fit the content on. You might need to just select a line or two at a time or select All. Apply a 6-point font or less if necessary, and I like to use a sans serif font like Nimbus Sans L or Helvetica. Now you can see all the content.