I’m sorry to say yesterday some of my lists dissapeared (again) I just checked I’m on version 2.5.8.
I’m not sure when that version was updated. But yesterday I created some new lists for my lessons on the web app, they were on my phone before I left the house, but when I opened clear at the start of my classes they were empty. 
Other lists, even recently edited ones were still there, so the bug seems to affect only new lists. Very annoying, as I rely on my notes to teach a good class.
Hey, sorry to hear about that experience - I’ll forum DM you a link to send in logs and we’ll take a look at what’s going on there, and also grab some more details to troubleshoot!