Bag after Arrey modifier

I got such a bug, what can it be and how to fix it?

We need more information…with just a cylinder with an array modifier as you show…there is no reason that would cause this in Blender…but if you look at your screen-shot your gizmo is also all smeared like the edges…so it leads me to think it is a Grafix card problem where you moved around the scene and the edges rendered as it moved.

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Welcome to the community, @Yurecs! To follow up on @RSEhlers’s post, if it is a problem with your graphics card, there are usually only a few things you can do to fix the problem.

  1. Update your graphics card drivers. If that isn’t an option,
  2. Get a new graphics card. If that isn’t an option,
  3. Get a new computer. If that isn’t an option,
  4. Revert back to an earlier version of Blender that has less updated graphics card requirements.
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