I been experimenting with modding on top of a-spec on the last couple of days and I hit a roadblock where after I recompile my changes the game starts acting weird, the demo replays have cars not moving or fully acting erratic, some rally ghosts are broken and the most notable issue is with tire upgrades on many cars, for example if I get super softs on the F50, they get installed on the front but the rear ends up with random tires that were never purchased, even changing to the super softs don't work at all, it reverts back after the race. (pictured in the spoiler below)
All the changes I've done were to the event prize cars. Extracted the a-spec GT2.VOL with GTVolToolGui, used GT2DataSplitter to decompile the files I wanted to change, recompiled it back with the same tools, and used IsoFileReplace to put the GT2.VOL back in the game image.
Am I doing this wrong?