Scheduled Posts Turn Into Drafts

I've been having an issue for weeks where I'll schedule a bunch of posts, and when I go back to the calendar they miraculously are now drafts. I've even caught this before and switched them back to scheduled, just for them to switch to drafts again. No clue why this is. It doesn't happen every time.
The only thing I could see causing it is sometimes I check the calendar on my phone instead of my computer, it realistically shouldn't be happening. (Computer runs on Windows, Phone is Android)