[Bug] Post upvotes and downvotes are not stored at all

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.