I tried the example you give, and it works perfectly (i.e., the way it's
supposed to work).
Have you tried this on a brand new document, and do you get the identical
behavior? Also, what version of Word are you using? That sometimes can make
a difference.
If you get the identical behavior in a brand new document, then we have to
start considering various kinds of corruption that might be causing the
altered behavior.
To create my 3-page document, I typed:
=rand(14,14)
and pressed Enter. This creates a bunch of instances of "The quick red
fox..." I then placed a sentence in a text box on page 3, bookmarking the
word "brown". Next, I bookmarked text on pages 1 and 2. On page 2, I
inserted a hyperlink to "brown". When I Ctrl+Click the hyperlink, Word jumps
to the word Brown in the textbox on page 3.