CHILD SAFETY CAR SEAT ON CENTURY GRACO MODEL: 44630LTH BRAVO LX5-P. THE HARNESS ON THE SEAT MALFUNCTIONS REPEATEDLY - GETS STUCK SO I CAN'T TIGHTEN IT OR SOMETIMES CAN'T LOOSEN IT. MY 1-YEAR OLD NOW HAS A SLIGHT BRUISE ON HIS SHOULDER WHERE THE STRAP LAY