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The strength of your vote depends on the strength of your SP. Right now your strength is too low. It is less than 0.01 and is therefore not reflected. But still, your voice has value, just so far very little.
You need to increase your SP :)

That's true. But once I saw that my upvote changed the value a little bit. Seems to vary.

As your SP grows you will see different numbers :)
It may also surprise you that the payout figure under your post changes up or down without someone upvoting your post. This is also normal. This figure depends on the exchange rate of the token. She changes frequently.