In the parchment the Goblet of Fire spit out, why wasn't the school name there?

Question

In the Goblet of Fire, students were supposed to put their name and the name of their school in the Parchment they put inside the Goblet.

It is clearly stated that Fred wrote "Fred Weasly, Hogwarts", in his.

But when the parchments come out, the school's name isn't there. It simply says 'Harry Potter'. Why?

Since no one was surprised at the absence of school name, I don't think this was the result of Moody's Confundus charm.

Answer 1

Warning: largely speculation

The wording is unclear. It is never shown exactly what is on the parchment that is spat out of the Goblet. Dumbledore states that after submitting their parchment...

Tomorrow night, Halloween, the goblet will return the names of the three it has judged most worthy to represent their schools.

We can read that two ways - it returns only the names, OR it returns the exact parchment that was deposited in the Goblet in the first place, school and all. If the school Champions were announced in school order I'd just say the former for simplicity, but Dumbledore doesn't announce the school until he's actually read the parchment so...either he knows all of the possible candidates and their schools from memory (which, given that it's Dumbledore, seems fair enough), or the school name is written.

Given this quote

Next moment, a tongue of flame shot into the air, a charred piece of parchment fluttered out of it ­ the whole room gasped.

I'm going to suggest three possible answers to your question.

1. The Goblet just returns the name of the candidate on a piece of parchment. This is not the same piece that was submitted. This requires the basic assumption that Dumbledore can remember a few dozen students names and school affiliations.
2. The Goblet returns the original piece of parchment, but the name of the school is charred off. Depending on how you read the above quotation, this may be a stretch.
3. The Goblet returns the original parchment, but Moody called the new school "". That's right, he named the new school blank, what you'd call in computing an empty string. This way he has a fourth school, and Harry's would seem to come out with just his name on it.

Answer 2

I think that Dumbledore probably just knew who the candidates were (he would know his own students and the other two schools were all-boys and all-girls respectively), and I think all the students would as well - they would obviously know their own school students, and it probably wasn't hard to figure out where the other contestants came from (especially when the candidate in question was standing in their school uniform with cheering classmates). Also, cheering would probably drown him out even if he tried to read the school.