Weekly chart showing dates that aren't correctly aggregated

A Domo user ran into an issue while creating a chart.

Their problem:

I have a chart plotted by week, which shows some dates which aren't correctly aggregated (always with a value of zero). I checked the underlying dataset and couldn't find anything special with the rows on these dates. Has anyone seen this before or an idea, what might cause this?

The solution:

Use the "Tiered Dates" chart properties.

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Thanks!

-Grant