My bet is this is a miss print and probably a 9 MM. I know some 1911’s were converted to 38 special and shot wadcutter ammo for bullseye competition. The S&W model 52 shoots 38 special ammo and it is possible someone converted a P-38 to 38 Special. If the P-38 had been converted to 38 Special it would be very unique and I’d suspect more pictures to highlight the fact it was converted.
The pictures of the magazines appear to be unaltered 9 MM mags and are stamped P-38. I bet the pistol is unaltered WW II pistol.