Assigning cell to variable only assigns first value

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I have a function designed to return a string by comparing an input string against a predetermined array defining pairs of values. The problem is on the very last line which doesn't seem to like setting the final cell array of strings. grouping is a scalar string, and groupsCats and catsBehavs are both 2xN cell arrays of string pairs.

      function behaviours = getBehaviours(obj, grouping)
          [~, catIndices] = find(strcmp(grouping, obj.groupsCats));
          catName = obj.groupsCats{2, catIndices};
          [~, behaviourIndices] = find(strcmp(catName, obj.catsBehavs));
          behaviourIndices = rot90(behaviourIndices); % Rotate to return correct strings in next step
          behaviours = obj.catsBehavs{1, behaviourIndices};
      end

During debugging running obj.catsBehavs{1, behaviourIndices} will return the correct list, but assigning it to a variable will only set the first value on the array. I'm pretty sure I'm missing some basic cell syntax here but I can't work it out.