Field contains list and values of it are shown in one symbol
You need to have the allowed values settings in the following format:

allowed_values:
  -
    value: '1'
    label: A
  -
    value: '2'
    label: 'Bb'
  -
    value: '3'
    label: Ccccc


The quotes don't matter for single word strings. I hope this helps.