Edit: Oops, Wrong MWU thread. But this applies to IL too.
Same thing happened to me 2 cycles ago. Mine was a composite letter from my undergrad: just a bundle of letters with a cover letter just saying it was a bundle of letters. When they showed up in the portal, it showed one science letter and then the cover letter. So, probably the first 2 "pages" in the file. I emailed explaining and it was fixed right after. Seems like a mismatch in how they import or something in addition to just getting to each applicant whether it's in chronological order or cheery-picked based on other things they see first. As a side note, I've heard they like a solid letter, not too generic. Just keep an eye on it. The good news is that you're all early still and they interview plenty. Knock their socks off and you'll get in. Your app is completely of the table once you interview. Feel free to PM me if you want an interview rundown. It's long and I prefer to not post it here. If your letters don't correct soon, act on it. One day an interview option will just pop up, probably before you get an email. Another piece of advice, don't reschedule if you don't absolutely need to. It's so easy to switch dates in their system and seems harmless. One dude a few cycles ago got called about it. Kind of a, "do you want to come here or not" sort of thing. SDN folklore? Maybe. But it doesn't surprise me.
