Edit a drop down menu

I have a drop down menu on a form.  The dropdown menu is a list of class choices.  I have tried to edit the options but it won't let me add to the list.  

In edit, the list of classes appears like this:

Astrophysics|Chemisty of Medicine|Electricity and Engineering|Forensics|Pre-Calculus|Beginning Debate|How to Stop the Madness: The Role of Diplomacy|Minnesota History Day|Mock Trial and Legal Issues|Politics and American Humor|Rise Up!  Social Justice in the 21st Century|Write Stuff - Produce, Polish and Publish|Architecture and Place|Improvisational Project|Opera OnStage

Rather than a list like this:

Astrophysics
Chemistry of Medicine
etc.

Again, the user sees the list correctly.  I just can edit the drop down options.

Hello,

Can you try modifying your items from the options list on the toolbar instead and see if this allows you to update your form?

Thanks.