This has happened to me no matter the browser or device over the last few years. Ipad, Iphone, an android phone, pc, mac, doesn't matter. I've used chrome, firefox, edge, safari, doesn't matter. Now the numbered lists change to bullet format and they don't change back. I think this may be it for evernote for me. The entire point of this software is to keep notes organized, and it can't even do that right. And like other posters have said this has been several years.