I think what timofonic means is he did a bad job of explaining here, what he thought was wrong.
To a non-native English speaker, "contributing back" might be understood as the best way to express "releasing the modified source back into the world".
"I didn't explain it wrong. I'm sorry." seems to be mixed up as well, if he's "sorry" then he clearly mixed up "I didn't explain it right" and "I explained it wrong".
Give the guy a break.
