It’s interesting to visit threads from an mbin instance because it shows you the number of up votes and down votes. When I see a Lemmy thread with 10 up votes then I go over to visit the same thread from mbin and see 20 up votes and 10 down votes, it really gives a different perspective.
That confirms it then: it’s a client feature. I also have a dbzer0 acct as you do, but I only see the total, which apparently can be attributed to the stock web client.