That reminds me of my University of Washington letter
The first word was "Congratulations!" and I thought I got into one of my top schools
And when I scrolled down, it said that I didn't get direct admit into CS (almost certainly the only way to get in) and was placed into pre-sciences. So it felt like a rejection since I read posts like this one and realized pre-sciences isn't worth it
Then I got an email a few days later from UW saying I was placed on a CS waitlist
An emotional rollercoaster that just amounts to "wait and see"
smh it's almost as bad as getting flat-out rejected