starsense

Can anyone tell me why I cannot set latitude and longitude coordinates on my Celestron Nextstar8se with StarSense Auto align? I have been trhough meticuclously all the instructions in the booklet but only once was I able to set some reasonably correct coordinates because only once I was given the opportunity to do so. Since that first time, now any time I reset the scope to align there is no option to enter the coordinates and I know the scope is not aligning properly. Time and date are reset correctly each time but the time zone and long and lat cannot be set properly.