Shape changes in certain zoom and in PNG export

Hello, I have the little line (shape, fill) as shown in the attachment here.

I can't see any error in the nodes (at the left). It's correct when I zoom in certain factors (middle). And it exports like that in Photoshop.

But when I activate the overprint view and zoom, in some (not all) zoom factors there is like an artefact. At the right in the image. And most interesting: exactly this is also exported then as (high resolution) PNG.

Why does Corel change the shape in the zoom and especially in the PNG ? (while Photoshop does not)

Can I somehow find a solution so that Corel just exports the shapes as they are really?


Thank you.