Did you check a block explorer? E.g. https://www.hiveblockexplorer.com/@resonator
There might be something wrong with the way the vote is shown on front-ends, while it is actually recorded on the blockchain. Or it might take more than 3 seconds when blocks are full. I do see the vote you mentioned, see the screenshot.
The same might happen to YouTube or Twitter, because they use multiple serves, and it takes a few seconds to synchronize them all. And Reddit implements 'vote fuzzing' on purpose.
in this case the blockchain is meant to be universally syncd across nodes
thanks for checking the block explorer, the vote and its effect never shows up in the front ends, so either there is an issue with the processing of the vote in the backend and/or middleware or the front ends are using the same erroneous code as each other.