Thanks for your support. You're right that we are running multi currency. The good news is it appears the issue is no longer present when testing. However, there is another issue I have not noticed, regarding stock thresholds with and without ATUM out of stock override. Video here: https://www.loom.com/share/5de5464a2f404106a27ff49d3c84975f
Using WC settings, our stock threshold for low stock activates at 50 units and shows exact stock available. This is no longer visible, showing In Stock at all times now. I tested ATUM's override for our of stock, however, this shows In Stock, no matter what value of stock is available. Even when zero stock is present.
FYI, when testing, I'm saving settings, republishing page, clearing all caches, and testing with both Chrome and Firefox in private/incognito sessions. I'm at a wall on this one. I'm not sure it if relates to geolocation (likely not), so let me know if you need to report on a separate ticket for this new issue.
Thanks and best