Female Born 12/19/70

HOW IS IT POSSIBLE THAT THE CERT. OF LIVE BIRTH CAN BE SIGNED OVER A YEAR LATER? I WAS BORN 12-19-70 AND IT WAS SIGNED BY FLORENCE IVES DEP. REG. ON 12-19-71. BUT THE ATTENDANT, DR BOYCE WEST SIGNED IT ON 21/21/70. IS THIS NORMAL? MY BIRTH NAME WAS LISA ANN PHILLIPS, WHICH IS NOT ON THIS CERT. BUT ON THE COURT RECORDS. AND LASTLY, I STAYED IN FOSTER CARE FOR A FEW WEEKS, HOW CAN I FIND OUT WHERE? I HAVE A NAME AND AN ADDRESS, SUE NOBLE OR NOBLES, I THINK SHE MAY HAVE BEEN FOSTER MOTHER BUT I HAVE HIT ROADBLOCKS WITH EACH CALL. ANY HELP WOULD BE APPRECIATED. TONI at tcaword@alltel.net