Do AI detectors flag non-native English writers more often?
Yes
Yes, and it is one of the best-documented failure modes in the field.
How it works
Detectors score low lexical variety and simple, regular sentence structure as machine-like. Writing carefully in a second language produces exactly that profile.
The part people miss
If English is not your first language and you have been flagged, this is the context to bring to the conversation. It is a known limitation, not an excuse.
Flagged for something you wrote yourself?
There is a right order to handle it in, and editing the document first destroys your best evidence.