Learn what "their background doesn't add up" means, when people say it, and how to use it naturally in English.

This means something seems inconsistent or not believable.
From Help! I’m Falling In Love With My Rude CEO, Episode 15
The speaker points out that someone’s background information seems inconsistent or suspicious.
Use it when facts do not seem to fit together. It is common in conversations about lies, mistakes, or suspicious behavior.
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