The DXF file format was created by Autodesk originally to transition older AutoCAD files to newer versions of the software.
DXF always does things like chop long lines into small segments when opening in AutoCAD and some times scrambling the text if the DXF file was created some where other than AutoCAD or another AutoDesk app.
I use to see this happen with the old qcad and a couple of other cheap CAD packages.
It has to be the nature of the DXF file format created by a non-Autodesk app.