Under both cases, even if OP had post-realignment J and pre-realignment F the amount of miles is still wrong.
F is under domestic at 200% while J is under international at 175%, neither being close to 125%.
The question is,what data is FB using to credit DL domestic flights? Delta's updated booking classes or the ones on their website considering Delta might be sending post-realignment booking classes into their system after the flight.