No error — but the result is wrong
External links hiding in data validation — find and remove them
There's no error message here, which is exactly what makes this one frustrating. Here's how to tell it happened — and how to catch it before it bites. Drop your file in below to check.
What you'll see (and what you won't)
You won't get an error. The file imports or opens “successfully,” but the result isn't what you expected — which is exactly why this slips through unnoticed.
Why it happens
A value in the wrong format, a blank where the system expected a number, or a column the software quietly ignored — small things that don't trip an error but change the outcome.
How to check
Upload the file above. The tool reads what's actually in it — not what you meant — so you can see the mismatch before it reaches your store or your report.