Yes, that's weird. They show up in safari but not in chrome....Maybe check your browser? A ton of items are available online (US) with 'Add to Bag' button.
For the vintage alhambra WG 5-motif bracelet, "Add to bag" show up both in safari and brave browser on my computer. I'm in EuropeYes, that's weird. They show up in safari but not in chrome....