This is because many OFT tunes have the internal calibration id of the roms altered to suit the OFT system
Failure to understand these alterarions can result in a bricked ecu .
The oft F40C USA rom is actually based on an A01G European rom
The definitions your using for ecuflash get fooled by these alterarions , this also happens in romraider
while link below is for romraider rom editor its same deal for ecuflash
https://www.ft86club.com/forums/showthread.php?t=79152
romraider logger does not work with brz 86 its never been set up