When a note is sent using Notezilla , it will be received as a pop-up note.
Watch this short video for more clarity:
However, if there are multiple unread notes, Notezilla shows up as notification (instead of showing the sticky note).
Go to Notes Browser, go to "Unread" filter and read all the notes. Just click on each sticky note once so that all are read. After which all notes received will popup directly on the desktop.