Could anyone what’s happening? I’ve just followed this simple tutorial and this what’s happening 
Apply scale on your object. Possibly also apply rotation, depending on which effect exactly you’re looking for.
Object Offset in Array modifier considers offsets in all three transforms - location, rotation, and scale. I.e. if there’s a difference between your object’s scale and the Empty’s scale, it’ll be used in the array. Same goes for other transforms.
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Thanks for the quick response. The problem is that it happens just adding an empty space without even modifying it. So still unresolved