GMAT

Just got another GMAT score report after I sent my scores to Wharton and noticed something strange. The percentile scores reported on this are different from the ones reported to other schools ! My quant and AWA percentiles decreased whereas my verbal one increased ! Is this normal ? And do schools use the scaled scores or the percentiles ? I'm confused now, I thought the %-iles were fixed for the time one took the test, and didn't change with time. Weird.

If this is indeed the case, then it can be inferred that recent test-takers have been rocking their quant scores while doing not-so-stellar on their verbals. Is it test-taking-season in India/China already ;-)