Once I upvote a post, it would show me orange color that I have upvoted, but then as soon as I click on any post or change the page, I will come back home to find out that non of my upvotes were registered or stored.
This bug does not happen when I browse online then open the app. Only my upvotes through the app don’t get registered.
You are just seeing the prior cached entry when returning home, it doesn’t reload the posts automatically (saves a good deal on processing/bandwidth). You’ll need to refresh if you want to see it registered.