I just made a new reddit account earlier today. Why are my upvotes not working?

I know that new comments automatically have one upvote (unless a user downvotes their own comment). When I upvote, it adds 1 to the number (so like 1 goes to 2), but then if I refresh the thread or leave the page and come back, my upvote button is still orange as if I've pressed it but the number goes back to 1.

I'm not talking about subs where the votes are hidden for a certain amount of time. This is after that time period has elapsed and the votes actually display