The crossed laser lines have different brightness - is this normal?

This post on Facebook has been pending for a week now, so I decided to write it here.

Is it normal for one of the lines in cross-laser mode of Einstar RockIt to have one very bright line and a couple of relatively “dimmer” lines nearby? (First photo)

Photo 1

I also asked another user to take a photo of their lines—they’re all the same brightness (second photo).

Photo 2

P.S. For some reason, even one photo wouldn’t load, so I had to insert links to them.

Actually, I’m interested in whether this is a defect and covered by the warranty, so that if anything happens, I can contact my seller with specific complaints. P.S. I was finally able to upload a photo.

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