automatic numbering problem when converted to html

I have an automatically numbered list (created with Format>Bullets and
Numbering). It has items 1-12 with various sublevels under each. When I
save it as and html file and then open with internet explorer, it changes
item 12 to 11 and leaves the previous 11 (so that there are now 2 items
numbered 11).



The same thing happens if I copy and paste the Word page into a new page
using FrontPage.



Any idea what could be happening? How to fix it?



Thanks,



Huck