Understanding Society User Support

Is there a source of definitive information about the gender of individuals from the BHPS part of Understanding Society? In most instance, of course, the data match from wave to wave. However, there are a small number of cases where this does not seem to be true, with pid values as follows:
A. 12104876 – after 22 waves of “male”, Understanding Society Wave 6 has “female”.
B. 15249832 – after 18 waves of “male”, Understanding Society Wave 2 has “female”.
C. 94654395 – after 10 waves of “male”, Understanding Society Waves 2-5 have “female”, before Wave 6 reverts to “male”.
D. 118773119 – after 8 waves of “female”, Understanding Society Waves 2-3 have “male”.
E. 119147807 – after 8 waves of “male”, Understanding Society Waves 2-6 have “female”.
F. 119194929 – after 8 waves of “female”, Understanding Society Wave 2 has “male”.
G. 119221578 – after 8 waves of “male”, Understanding Society Waves 2, 4 and 5 have “female”, before Wave 6 reverts to “male”.
H. 165683759 – after 1 wave of “female”, Understanding Society Wave 2 has “male”.
Some viewing of sex_cr suggests that the above cases are not a direct result of a discrepancy between an initially reported value for the sex variable, and a sex_cr correction.