Not sure if it's more of an urban legend, but the old story went that one (or two?) Soviet Mars probes in the 80s went wildly off course because of the typo in their nav software, allegedly written in Fortran. A comma was misplaced for a dot.
when DO I = 1.100 was used instead of DO I = 1,100
Mariner I, a spacecraft bound for Venus, was lost July 22, 1962 due to a combination of hardware failure and software error, https://en.wikipedia.org/wiki/Mariner_1#Cause_of_the_malfunc... . (I misremembered this as a similar Fortran error.)