This question is about random formation of knots in a systematically tied rope. I will give some background, hope that does not make it off-topic.
In climbing (and sailing) one has to store very long ropes (over $25m$) and have them quickly available for use. There are several methods for tying these ropes into bundles. In lack of a better way of explaining it the method I use is described in this video (important part starts at 1:25, watch till 2:30).
It has always worked fine for me and I know that a lot of climbers use it and do not have any problems. Now recently I picked up another hobby: slacklining. The slackline I currently have is about $100m$ long and I use the same method for tying it up. But when I try to untie it, I always find it entangled with knots having formed... and they are sometimes highly non-trivial.
The main differences between a slackline and a climbing rope is that the former is a flatband and the latter is a round rope and that they are made of a different webbing (climbing rope's surfaces are usually a bit rougher).
Why do these properties make a difference? Is there possibly a way to adapt the method of tying it up?