Some formula fields calculate correctly for most records but return unexpected values for others. The formula itself hasn’t changed. The affected records don’t show obvious differences. I’m trying to understand what causes this inconsistency.
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Formula results depend entirely on underlying field values, including nulls and data types. Records that look similar may differ subtly, such as having blank values instead of zero, or unexpected picklist states.
Cross-object formulas add more variability because related records may not exist or may change independently.
The most reliable fix is handling nulls explicitly and simplifying formulas where possible.
Takeaway: Formula inconsistencies usually reflect data inconsistencies.