That is normal if a little shoddy. Best solution is to by some FABRIC electrical tape and wind it tightly around the nylon sleeving and then the exposed wires, up to a point that you are happy with. Don't use standard electrical tape as it looks bad and is a cheap and dirty fix.
This is the stuff you need and what I use:
https://www.amazon.co.uk/Fabric-fle...argid=aud-543776533562:pla-441108393723&psc=1
This is the stuff you need and what I use:
https://www.amazon.co.uk/Fabric-fle...argid=aud-543776533562:pla-441108393723&psc=1