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There also seem to be quite some delays in showing votes; on beta.steempeak in activities I can see that I received 2 upvotes on a comment 3h ago. If I look at the comment, it shows 0 votes.
Both votes might be dust votes, so maybe that's why?

https://beta.steempeak.com/@captainklaus/re-berniesanders-q5cdye

Yes, I have noticed the same behavior a few times. I think dust votes are not included in the post details when using the new API to save some bandwidth.