Your pulleys and pulley lines are highly worn. These are wearable items, i.e. you should replace them from use. The Flysurfer pulley lines fail gracefully. The outer sheath will fail before the inner. You will notice this as a roughness or bump in the sheeting. You should stop kiting when you feel that, but it can be hard to notice for a first time.
I would suggest you rinse and check your pulleys ain't stuck after each session. If they are damaged on the sides like that, it is from wear and they can damage the pulley line very fast. You should replace them and the pulley lines when like that. You can rotate the pulley lines 180degree to get some more life from them when they first start to show wear. Otherwise making pulley lines is not hard. If you are super concerned with them breaking you can use 3mm line. I use 1.5mm line. I don't really have an issue with them breaking as I usually can still fly and ride the kite back to shore. That said if I catch them obviously about to break I will replace them, which is quite easy with the line flysurfer uses.
jorg wrote:There are about 40 sessions on this Soul
This may or may not be right. The pulley lines last about 200hours, pulleys can be up to 400 but usually less. I would guess you have not rinsed your bar and pullies well enough.
Another thing to note though is these wear as a result of sheeting or steering. So the less or more you do that the longer or shorter they last.