I've been using Shopify with Facebook for a while now and I had noticed that the order of the variants of a product were in the opposite order to those listed in Shopify. While this wasn't great, it wasn't awful.
I've now found that all of the variants on the Facebook shop are in a completely random order.
Amongst other items I have rings as products and the different sizes as variants. The ring sizes are now all scrambled and look more like an eye chart from the opticians, than a nice alphabetical list of sizes.
What is going on? This seems to have happened to other existing products too, the variants are all now in a random order.