I play barbarian.
When choosing skills on the left mouse button, there is only an earthquake, the call of the ancients and the wrath of the berserker.
The skills of key 4 are duplicated.
Is this a bug or is it necessary?
I’m not entirely sure what you mean, but check if “Elective Mode” is enabled (go to Options > Gameplay > Interface).
Thanks, found there how to solve this problem