[NTG-context] unwanted extra interline space in typing environment

Dear list, I have a document (http://ediciones-criticas.tk/pdf/criticas-context.pdf), which is shows a weird issue: some typing lines have an extra interline space added. It can be found on the first code samples on pages 11 and 12 from the above-mentioned document (sorry, but I have no other way to recreate the issue). My configuration is the following: \setuptyping[margin=yes,lines=yes,blank=line,space=on] How can avoid the unwanted extra interline space in the typing environment? Many thanks for your help, Pablo -- http://www.ousia.tk