My instant reaction is that your school is guilty of malpractice - you should never have been allowed to take the memory stick out of the exam room. It is equivalent to being allowed to walk out of the room with your paper - your script should either be printed in the room or a member of the exam staff should have collected it for printing, ideally escorting you so you remain under exam conditions until everything is safely printed and you have signed all the pages confirming all your work is there.
Schools aren't allowed to share letters from exam boards with students which probably explains the redaction.
As you'd been out of exam conditions taking your memory stick for printing I presume that is why they decided they couldn't accept further work.
They'll have a standard letter and they just forgot to delete the UCAS bit.
It's worth getting the school to chase this up but I can more or less see why it's landed up like this. Just remember in future to check you've saved to the memory stick!
Very odd that they predicted you an 8 in language and a 4 in Lit.