It appears that when I converted a song of mine to an NSF, whenever a mute bar is played in the DPCM channel, the portamento in my square channels mess up. Attached is the ftm and nsf. It happens in frame 07; it sounds fine in the ftm, but messes up in the nsf. I'm using the 0.2.8 WIP 4 version, so I dunno if it just may be a bug in that version or if it's been like that for a while...
