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It happens sometimes, but SteemData will usually catch up at some point. Nothing we can do in our end, sadly. We might switch to SteemSQL though.

You're welcome to use SteemSQL.
I'm working hard to keep it always in sync with the blockchain and you can monitor it here

I just took the monthly package =)

Just moved one of my tools to steemsql for the same reason. It seems that the upvote (and other) data isn't being synced correctly on steemdata.

Thanks @markangeltrueman for being a SteemSQL user and glad you are happy with its service.