If new Notezilla sticky notes are created on phone appear on computer, then even edited notes should be updated on computer. Because all sticky notes and changes are treated the same.
Please make a change on phone in an existing note, press back button so that the note is saved. Your notes list should update the list after you make a change in a note.
Then go to Sync option in phone app and tap on Sync Now button.
Go to your computer, right click on Notezilla icon (next to the clock) in the taskbar and select Sync option from the menu. Click on Sync Now button and check if you see the change.
Make sure all your devices have the same date, time and time zone.
You can also watch this short video for more clarity: