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Round slot checking pattern changed. How to fix it?

 Good Morning.

This morning when I started a new program, I found the round slot checking pattern was changed for 10 hits, the find hole 6 hits check was normal, but it did not verify the width in 10 hits , only on 2 arcs( Please check the attached image for measured points). I never met this kind of issue before, How to fix it?

Is it possible that the issue came from Cad which we use .stp files?

Thank you

My is v2015.1