Last time I checked,
10 + 10 + 10 + 50 ≠ 20.
It survived a couple of reloads, although it's now correct.
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The day totals are cached for 10 minutes currently...but there's no reason can't can't add up the day's query and use that to update the totals on pre-expanded days.
You shouldn't see mismatches on pre-expanded days after the next build. We'll update that total on page load for those few days that are shown by default (or more days if you're coming in from your profile popup, etc.)
Note: the total will still be lagged up to 10 minutes on the graph, but this is both less apparent and needed for sanity.