Hi @tecknot,
I am not able to create the situation I am experiencing either. It has happened to me many times in the course of working on projects, but I don't seem to be able to make it happen. Or make it not happen once it has started.
A couple of interesting observations. First, you do not seem to be able to Ctrl+L a step sequencer clip. It doesn't seem to have an effect. I guess that a step sequencer clip includes the looping attribute set to yes.
Second, if you make a step sequencer clip and then copy it, the two clips are linked. If you then change one clip to piano roll, it unlinks the clips.
The behavior yields some unexpected results because normally copying a piano roll clip would create linked clips as well.
Best,
Hendrik