If it is not apparent where the problem is I would start over or create a new column and add one item at a time. Will maybe show you where the problem lies.
I think calibre follows spreadsheet conventions for fixed value lists. Speaking as a once upon a time programmer, you have to follow the rules pretty carefully in this type of situation. Commas have a specific meaning and addition or omission can lead to unexpected behavior.
I usually preface my fixed value list items with a number so I can easily enter them from the GUI with one keystroke.
Helen
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