Christmas, Siroë, and Error

When I click on "All tunes used with Awake My Soul, Stretch Every Nerve", the results correctly state that by far the most common tune for the text is CHRISTMAS, but then they go on to say that its meter is 8.8.8.8.8.8, when anyone who has ever sung "While Shepherds Watched" and knows how to count knows that it's 8.6.8.6.6. There's also a result (1 instance) for SIROË, which is the same tune as CHRISTMAS; the meter given for it is correct. I'm going to merge SIROË into CHRISTMAS, but I don't know how to change that 8.8.8.8.8.8 to the correct syllable count.