I assume that you inserted the figure captions via Insert > Reference >
Caption.
The figure caption numbers are fields and a document can contain up to
32,000 fields according to the article "Operating parameter limitations and
specifications in Word" found at
http://support.microsoft.com/kb/211489/en-us.
If there is a limit of the numbers, it must be high (I just made a test with
5000 figure captions, all numbered correctly).
Things you could check:
Are all fields updated (Ctrl+A, then F9) - if you copy a figure caption
field and paste it elsewhere, the old field number will remain until you
update the field.
Try to toggle field codes (Alt+F9). The code of every field should be
something like this:
{ SEQ Figure \* ARABIC }
Have a look at the field with the wrong number. Does it contain _exactly_
the same text string between the field braces as the preceding field (which
was correct)?
Note that all SEQ fields with the same identifier (in this case "Figure")
will show sequential numbers. If you change the identifier, you will start
another numbered list - the first item in the list will be numbered "1". If,
for example, the identifier in your caption 57 is “Figure†and the identifier
in caption 58 has been changed to “Figurâ€, the number in caption 58 will be
"1" (not a member of the same list anymore).
SEQ fields with the same identifier can also be reset to a specific number
by adding a switch, "\r", followed by the desired number. For example:
{ SEQ Figure \* ARABIC \r 3 } will reset the sequence number to 3.
If more fields of the type { SEQ Figure \* ARABIC } follow, they will be
numbered 4, 5, 6, etc.
For more details about the SEQ field, see the Word help on "Field codes: Seq
(Sequence) field".
Hope this helps.
--
Regards
Lene Fredborg
DocTools - Denmark
www.thedoctools.com
Document automation - add-ins, macros and templates for Microsoft Word