Now after the HF21, your vote value depends on the payout of the voted post. Since SteemWorld cannot predict, which post you will vote, it now shows the vote amount for a post that got no other votes yet (payout = 0).

There is a new Sim. Payout button below the Simulate SP button, where you can change the payout. It is not 100% accurate yet, because I'm still working on it, but for most users it should work quite well already. I would suggest to just play around with it for some time. The amount that you defined in there will be stored in cache, so it will persist when reloading the page.

One thing I want to add:
Keep in mind that you always vote the full (with your account/vp possible) rshares and that the vote's value increases also with later votes from other voters, therefore it's really hard to predict the final vote value now.