Developer finds checker tool was wrong in all 67 mismatches due to parser bugs

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A software developer discovered 67 disagreements between a data verifier and the system it checks, initially suspecting the underlying data was at fault. Investigation revealed both bugs were in the checker's private parser: a nested ID variable overwrote its parent 47 times, causing the tool to look up the wrong row entirely. In 20 other cases, the parser silently collapsed 'not found' results into false, making missing data indistinguishable from a genuine mismatch. The checker also omitted both computed values from its mismatch reports, hiding the wrong-row lookups that would have been obvious if shown. The fix replaced the checker's independent parser with the same shared config reader used by all other components, after which all 131 test rows matched correctly.

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