I have the whole week-end to replay everything. I'll tell you as soon as I can if it fixed it ! Sorry for the late response but I'll be playing hard the whole week-end ! (What a sacrifice I know. I'm out but I can't wait for this evening and the end of the week ah, ah)
Edit : Yep ! You found the bug ! I still got the bad ending but it sounds way more logical when reading the whole.