That happened to me after I submitted the faculty list! I was about to submit my profile picture by clicking on the 'View Checklist' option, but there was no section to upload it. I wasn't able to submit my photo and currently am emailing with the coordinator back and forth to find a solution to this. I guess I was not the only one this happened to.
I know UT Southwestern does send invites at different times for domestic vs. international, but other schools don't do this. I got an interview for WashU at the same time as domestic applicants. I'm an international with a degree from the US.