Droplist item limit?

Is there a limit to the number of items a droplist can contain?  I have a droplist on my search card so users can select a job number.  The droplist is populated by a SQL query.  When I run the query in SSMS, the result is correct (shows all my job numbers), but when I run the search card and click on the droplist, I do not get all of my job numbers.

Thanks for any help!

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