Sequencer output

Why is not the same as in the output of the Sequencer and Windows, but the beginning is the same

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What are we looking at? What is the line?

This is my scene, the two figures above are respectively in the view and the effect of the output

Let me clarify. What in your scene are we looking at? The seam between two big meshes? A particle effect line? A sprite? A billboard? A separate mesh? a Widget? A debug trace? A material on a mesh? etc.

Two grid is in the middle of the seam, but I think may be shadows or AO, thanks a lot