Lost items in cars (Need for Speed: No Limits)

I install the parts on mazda rx-7 fd, as a result the details disappear with the money. speed, acceleration, nitro - rating falls for example from 5 stars to 3, or from 5 to 4stars and have to re-buy parts. But nothing changes... the drawings are absolutely everything already there, but the situation is still the same 😬😤🤬🤬 what to do?