In a situation like this, it is best to accept the result as it is, mix the caps and retest. The border between mild and moderate colour defects is not well defined.
Different employers have different limits for confusions tolerated for specific tasks.
Persons with colour vision deficiencies are not colour blind, they just confuse some colours. For example, protanopes and deuteranopes, both confuse some blue and purple shades and certain brown, red and green shades. Tritanopes match violet with green. Crossings across the colour circle are parallel to the deutan axis in this case. If only the binocular test is done, or the person has only one eye, the results can be recorded simply by writing down the numbers of the caps in the order that they are arranged.