Select Field Items all show up on one line

See screenshot: https://www.dropbox.com/s/g82ntk9b6abqtnd/Screenshot%202019-06-04%2009.48.49.png?dl=0

Basically, when attempting to use a Select Field with several different options, when trying to utilize front-end editing on the table, all the individual select field items show up on one line instead of several different lines. This makes it impossible to pick just one item. When back-end editing, it works properly. Has anyone ever run into this issue before? How were you able to solve it?

Thanks!

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