Using Arrow Keys to Navigate Between Terms in Glossary

I just noticed an odd behavior (or at least I think it is odd) in a glossary I have as a player tab in a Presenter movie. 

The glossary launches fine. 

When I click on the first term and then press any of the arrow keys - up, down, left, right - I go to the next term. 

The up arrow does not go to the previous term, just to the next term. 

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