propeller c

I am parsing a gps. When the clock hits 59 my screen jumps and sends a line of data below. Any ideas?? Thanks

// print("rmc magvar %s\n\n", _rmcmagvar);
print("day %d month %d year %d\n",day,month,year);

print("JD_adder %d\n\n",JD_adder);
print("A %d\n\n",A);
print("B %d\n\n",B);

// print("_gmathrs %d\n\n", _gmathrs);

// print("decimal_day %f\n\n", decimal_day);
// print("%c",NL);
print("%c",HOME);
pause(499);