One keyboard will affect anohter when press key at the same time

[fan31415]

If I press and hold the key on both users's keyboard, both user will receive the key signal even if I already allocated the keyborads to different users.
Eg. I press A key on Bob's keyboard and hold it, at the same time I press D key on Alice's keyboard, then Bob's computer will receive both A and D. It is strange. If Bob not press any key, then Alice can not affect Bob's computer. I met this issue today, before everything works fine.

[beast2040]

Try applying the chklevel100 registry patch.
Workplaces tab -> System section -> right click on the icon of system case -> Special settings -> chklevel100 -> Apply -> Restart PC.