Detectors measure predictability, and simpler, more regular grammar — common in second-language and careful formal writing — reads as machine-like to that measurement. A Patterns (Cell Press) study found 61% of non-native-authored essays falsely flagged vs ~5% of native writing. Check your own risk privately before you submit, and keep a version history as evidence. Kirla's free detector and editor do both — all your writing tools in one plan.
Enable JavaScript and visit https://kirlaai.com/why-non-native-english-flagged-as-ai to use the tool.