Help with exporting DXF files

I am using Version 32 and a novice user. While learning CAD functions, I saved a file as a DXF. When I open that DXF in other CAD programs, the circles are deformed and lines are not all connected. This happens in multiple CAD programs I use. Is there an export function that I am missing? Importing DXF files from the same programs into BobCad is not a problem.