Transparency and weird grid lines

[Hagen5C86]

I get these weird horizontal lines that are not real but when zooming and stuff they will glitch and it looks like stitching and it only happens when I change the transparency on embedded shapes and images and what not. Anyone had this problem?

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[BobLevine · Accepted solution]

They look like grid lines. In the future please post proper screenshots. It makes it much easier to see what's going on.