It looks like a shoe insert -- that is tilted up off the build platform. Can you "lay it flat" instead? Also you might want to sink it into the build platform a small amount if it's still not perfectly flat - this is under "advanced" "quality" I believe.
Can you show this same screen shot but from the side view more? I think the object is only touching the build plate at one point. Also include the layer height slider in the view - that slider on the right side.
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Labern 775
Have you looked at it in x-ray mode to see if there are issues with the stl?
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