I keep having the same issue in which my support material has some sort of stringing. I wouldn't say its normal stringing as it is thick short pieces. I have tried lowering the material temp, slowing the speed of the support speed (30mm/s) as well as having retraction on as well as retraction during layer change and retraction before outer wall. I also tried it with the combing mode on all. I have experienced this with multiple materials which are Ultimaker brand. If anyone has some suggestions I would appreciate it.