'add' action and auto-setting model id

I have weird (I think) problem. When I've added "add()" action to the
contoller, the id of coresponding model has been set automaticlly to
"add()" method parameter, and when I try to save data using that
action update instead of save is made.

This method singature looks like this:

public function add($someId).

Is it normal behavior? Do I have to manually call "create()" method in
my model if I want to save, not update data?
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