So if i am away from my PC, adding notes through the mobile will cause duplicate and possible loss of data when i accidentally consolidate to the wrong version.This is a real UX issue as we don't always has physical access to all devices to close notes before opening them elsewhere.
Possible features to solve this issue:
1. When a note is open on device A, and device B opens the same note, show a message that this note is open elsewhere and give an option to close it remotely. or,
2. Close notes after X minutes of inactivity. Maybe go to home page or something. This can be a toggle in options. or,
3. Implement real sync
Please Evernote implement one of these options!!