Our front LH side blind keeps having a kink in it. Have taken it down several times to try get rid of the kink , each time think I have succeeded but later on the kink comes back. The side arms are different height to the RH side ones . If I hold the blind at an angle the kink goes but this angle would make the blind channels one higher than the other by quite a bit . When I take it apart and pull the blind out it seems to have equal tension in that the rolled blind is not uneven . Any ideas guys?.