Well - what you have is not expected behaviour, so I'd suggest a clean reinstall of your current app, plus check your available local storage space - less than 10% free space can lead to anomalous results.
To fix occasional errors with installs or updates on laptops or desktops - plus issues with speed or lag or corrupted data.
1 - Sync notes up to date (check via web client or another device)
2 - Exit Evernote (if you can) / delete data from device
3 - Uninstall app with Appcleaner (Mac) or Revo Uninstaller Free (Win)
4 - Power device off / allow 10 seconds / power back on
5 - Download latest Evernote from Evernote.com
6 - Reinstall. It will take a little while for the app to be fully operational
If that hasn't fixed anything, check your local housekeeping - how much free storage space? What other processes are active? Do you have good network speed?