Did some testing with this one and couldn't get it to behave consistently but the first visited shop would just overtake other shop inventories. Visiting Jade would have Sera, then Inessa, then Anno, then Shekka sell her stock. Vending machines would also be affected though one time I did have a vending machine replace the stuck inventory (so now every shop had the vending machine interface). The only shopkeeps I didn't have this issue with directly was going Anno -> Shekka -> Anno. However doing that order again later did cause the issue.
Usually changing planets would fix it for the first shop (which then became the stuck one), but I did have an issue where Kirila on Uveto got stuck between her options, then that persisted to Inessa's shop on Tavros, but backing out of the menu and reentering fixed Inessa's menu that time.
Both saves behaved the same but on the chance they're helpful providing them.
Usually changing planets would fix it for the first shop (which then became the stuck one), but I did have an issue where Kirila on Uveto got stuck between her options, then that persisted to Inessa's shop on Tavros, but backing out of the menu and reentering fixed Inessa's menu that time.
Both saves behaved the same but on the chance they're helpful providing them.