Dropdown menu limit?

Hello,

I have a section editor called "manufacturers" and there are 1000 companies listed.

I am then displaying a dropdown menu in my "listings" section editor that pulls the manufacturers. The problem is that only 999 manufacturers are being displayed in the dropdown menu. The 1000th manufacturer seems to be missing...

Is there a dropdown menu limit somewhere that I can remove so that I can display all manufacturers in the dropdown?

Thank you,

Greg