dosubot[bot] commented on issue #38037: URL: https://github.com/apache/superset/issues/38037#issuecomment-3919064445
<!-- Greeting --> Hi @mandar0324! I'm [Dosu](https://go.dosu.dev/dosubot) and I’m helping the superset team. <!-- Answer --> Thanks for the detailed bug report! I looked into the code and found a likely root cause. **The issue:** When your near-zero negative values (e.g., -1 to -5) are formatted alongside a large outlier (-4,000,000), Superset uses the [SMART_NUMBER formatter](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/packages/superset-ui-core/src/number-format/factories/createSmartNumberFormatter.ts#L24-L47) which applies SI notation. For very small values relative to the scale, this can produce strings like `$-1µ` or `$-100n` where the micro (µ) or nano (n) symbols may not render correctly in the ECharts label, leaving only the `$` visible. Additionally, the [stacked bar threshold logic](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/plugin-chart-echarts/src/utils/series.ts#L58-L93) calculates percentage thresholds to filter which values display labels. With a massive outlier dominating the scale, your near-zero values become an extremely small percentage, potentially triggering edge cases. **Workaround:** Try overriding the default number format with an explicit d3-format string (e.g., `$,.0f` or `$,.2f`) instead of relying on the adaptive SMART_NUMBER format. This should prevent SI notation from being used for small values. There have been recent fixes in this area ([#37039](https://github.com/apache/superset/pull/37039), [#36989](https://github.com/apache/superset/pull/36989)) for related currency formatting issues, so this may be a new edge case worth filing if the workaround doesn't help. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? 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