Mesh issues with parts in contact when changed from draft to high

Hi,

I am running some non-linear static models in combined XYZ directions. The model solves with draft mesh but when I change to high quality I get an artefact of high stress where two bolted plates exist.

Any ideas how to remove this? I have changed the non-penetration contact on the plate locations from node to surface and surface to surface with no sucess in removing this?

Thanks,

Mark

SolidworksSimulation