Is this an array bug?

Hey I’m totally new to Blender.

But I found an strange behavior with Arrays. There seems to be an offset (a stairs effect) in the Z axsis, but I didn’t set there an offset.

I uploaded the blender file:
https://drive.google.com/file/d/1CIA6CCWUPM49NoeXEfbO3PGz-Zxdc4_9/view?usp=sharing

I can’t reproduce it, when I create a new array. There seems to be something broken in the file.

The Blender version is 2.91.0

Did I found a bug, or did I something wrong?

Hi.
Open N panel and enter edit mode. You see that vertices in the base plane are not at the same height Z. You select the 4 vertices of the base plane and you press the following sequence of keys: S, Z, number 0, Enter key.
Do the same for the upper plane.

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thank you, that was the issue!