Zanussi WJD1667W Front Load Washer / Dryer "strange lines going down half" Questions

strange one so i hope someone can help...please? First happened yesterday and had an E20 message appear. Turned it off and on and it came back with the machine on pause half way through the cycle...so

...strange part is other units on the market appear to have a much thicker rubber seal that would not get damaged so easily, with us being as careful as we can without watching to make sure no clothing ...