I have once again contacted Airbnb about reviews being out of order. They did phone me back which is great and the agent gave me the first rational explanation for why latest reviews don't show up first.
They explained that:
* Reviews are sorted on the listing page based in the following order:
1. Reviews in the guest/visitor’s preferred language come first.
2. Reviews from the guest/visitor's country come second.
3. All other reviews come last.
* Within each of those subgroups, reviews are sorted chronologically.
While this may make sense to a guest it doesn't make sense to hosts! My latest review showing at the top of my listing is from September 2018 because guests from other countries are showing on page 7 of 18 pages of reviews! They did suggest that if I went to Airbnb.com it would show them in the correct order but since I am in Canada, the computer automatically reverts to the Canadian site. We figured this out after I sent screen shots of what I am seeing and Airbnb are seeing the latest one as they are using .com
If Airbnb is able to manipulate the listing, why can't they just put the latest review first regardless of language and country of origin. Surely they reason for reviews is that a potential guest wants to see that you are still hosting and maintaining high standards.