When one of our participants was sharing his screen, the other users drawings were duplicated (about an inch above and an inch to the left). However, when I shared my screen, the issue didn't occur for any of the other users.
@Eric Fortenberry @Toon Engagor: could you both let me know:
1) Host: OS
2) Host: Resolution for each display
3) Host: Display scaling / font scaling settings for each display
4) Guest: OS, resolution & scaling for the display that the shared screen was rendered on
Had it as well, seems like it mostly happens when the screen size differs a lot between the one sharing their screen and the one drawing (e.g. drawing is on a smaller screen than person sharing)