It happened against different persons both with demo and with full game. I' don't know if they had modded or unmodded game.
Anyway, I maybe understood what the issue is caused from: a few days ago I downloaded some animations about services (e.g. Andreas Seppi service, McEnroe service and so on ) and installed into the game. If another online human player dont' have the same animation, that's why that strange issue occurs maybe...
I'll try to delete those animations and change service, and then I let you know as soon as possible
Thank you very much