This is because these are different accounts for the votes :)
If you are in tier 3 you receive an upvote from the "main" qurator account, which 2% upvote is more worth than the 4% upvote of the tier1-2 account :) (not to mention the curation trial)
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Thank you kindly... that might not be clear from the graph, then again it might be that I just missed it, which is quite likely!
Karl.
Exactly what @mwfiae said :)
There are three accounts that vote different Tiers to help us divide the VP more evenly.