The bug with the lower suspension (Car Mechanic Simulator 2018)

In story mission 6 why the break bushings in the lower suspension setting... before there was nothing. I bought new parts new bushings and suspension, selecting the parts all together 100 percent. and when tightening the bolts it is seen that the bushing 15 percent of the whole. I again unscrewed the suspension and bushings actually broke down from 100 percent turned into 15-20. what to do?