1. This note was created in Evernote on my Sony phone. More precisely, it was created before, and I edited it yesterday, and after I saved it, the aforementioned situation occured. (The creation was done on my previous HTC smartphone, and the edit is done on my current Sony Z5 phone)
2. Once I notice this situation, I wrote the previous article, so far there are no other similar situation on other notes, and this was never seen before.
(might also because other notes are long enough to fill up entire preview block)
3. Yes, it is also seen on the web version