I was correcting an ESL learner who said "It is the way how we write."
I realize "It is the way we write" is correct and "It is how we write" is correct, but "It is the way how we write" looks wrong to me, despite that when I say it out loud it sounds perfectly normal if I'm speaking fast. What I mean is, if an ESL learner said it, it would sound wrong. But when I say it as a native speaker, it seems okay though not felicitous. So I can't tell.
Is it grammatically wrong?