I would have really needed to prevent that from happening in the tutorial... (^^;) But sadly it is partly an engine bug, for which I couldn't find a workaround... Other than completely rewriting some stuff... (I was hoping this glitch wouldn't happen in the tutorial...)
I mean... it is corrupted, it was intentional. :D jk
More importantly, thanks for your kind words, I'm really glad you liked it so much! :)