DXF to DWG fillet problem

Hi.

I am new to DraftSight.

I have a question regarding opening a dxf file and saving it as dwg file.

I am trying to do a nesting file for laser cutting from acrylic material. 

I opened a dxf file which was made in some other program and saved it as dwg file - no changes made / just opened dxf and saved as dwg - fillets acted weird.

 

 

 

The fillets were weird after closing the file and reopening it as dwg.

 

Any suggestions?

Am I doing something wrong?

 

I tried to attach also the dxf file to the question, but it can not be attached as " the uploaded file is not authorized".