When doing the app exposé gesture, is it normal to see a thin white horizontal line at the bottom of the screen after minimizing a window?

I noticed that when I open two windoes (say Safari and Trash can) and minimize both windows so they go on the dock, when I do the swip down gesture with 3 fingers (App Expose´) there is a thin white horizontal line at the bottom of the screen. Does it happen to every macbook pro out there?  Is this normal?  Hope it's not a display screen problem...

You would have to have multiple pages of the app minimized.
This is what it looks like with Safari with 1 page open and 4 minimized.

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