I encounter a special document which single line spacing appears as 1.5
line,
even the paragraph setting say so. The vertical alignment is Top.
After changing the fonts, the problem still persists.

If ctrl+A then copy to a new document, the problem still exists. The
problem
disappears if the last mark in the document is NOT copied. What is the
problem? help!

The boss owns this document wants to know the cause..., not only the
solution,
help!