mmm.. I've left all by default,
Display Unit: Metric (automatic)
Internat Unit: 0.1 Meterd

The strange thing is that if I paint till 6 trees it displays just dots, the 7th is displaied correctly also the 14th 21st and so on...

If I click on the "View DIsplay Options" on the top right side of each viewport and I switch to "Wireframe Box", the problem persist.

what can I do?

Thank you for your answers