that workbook links to a lot of other workbooks.
Can you do this:
Please send a screen shot of the drop down rule:
select one of the drop down cells, then go to the data tab and click on Data Validation.
then screen shot that.
(Or type exactly what is the formula for the list).
But another way to fix that would be to extend the length of the list to make it longer than the source list (if you have 8000 rows, maybe you should change it 25000).
(There are probably more efficient ways to do that, but with all the disparate workbooks i think it would be confusing).