CorelDraw to SolidWorks not working

I am a very basic Cored Draw user using X7 version to create images for laser cutting. They work perfectly on my current machine, however I have now started to outsource to a laser cutter for metal cutting who uses SolidWorks and the files are not converting over properly.

They look perfect on my end and in Print Preview look the same, however when they get called up in SolidWorks weird shapes appear at random, lines become dots and some things disappear completely. I save them at .Dwg or .Dxf and have tried .tiff but nothing is helping.... can anyone shed some light?