Quick answer: Keep the original workbook, define the exact range and units, ask for a row-count and control total first, and verify every reported number against the source.
ChatGPT can misread headers, formatted values, hidden rows, formulas, or totals when a spreadsheet is ambiguous or too large. Work through one test at a time so the result identifies the layer that is failing.
Why this happens
The best clue is the boundary of the problem: one file or every file, one device or several, one network or every network. Note when it began and any update, hardware change, permission prompt, or account alert that happened just before it.
- Merged headers or blank rows make the table boundary unclear.
- Displayed percentages, dates, and currencies differ from their underlying values.
- Hidden rows, filtered data, subtotals, or formulas are included unexpectedly.
- The request asks for a narrative before the data has been validated.
Fix it in the safest order
- Save an untouched copy and remove unrelated sheets from a working copy.
- State the sheet name, header row, units, and exact range to analyze.
- Ask ChatGPT to report row count, missing values, minimum, maximum, and a known control total.
- Compare those checks with the spreadsheet before requesting conclusions.
- Request calculations in a table with the source column names and recheck a sample manually.
Repeat the same small test after each change. Keep a note of the original setting so you can restore it if the change does not help.
How to confirm the fix
The row count and control totals should match the workbook, and a manual sample should reproduce each important calculation.
Common mistakes to avoid
- Do not replace the only workbook with AI-generated values.
- Do not trust a plausible chart whose source range is unclear.
- Do not upload personal or financial columns that are not needed.
FAQ
Why can a percentage change even when the visible cells look correct?
The workbook may store more decimal places than it displays, or the summary may use a different denominator. Specify rounding and the exact numerator and denominator.
Should I reset or reinstall everything?
No. A factory reset destroys useful evidence and is rarely the first step. Back up important data, test a second file, account, network, or device, and use the narrowest reset that matches the confirmed cause.
Related PHWhy help
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