98 12 valve main bolts keep turning
 

Rebuilding this 12 valve, got new bolts from Cummins and several of them keep turning and won't come to final torque of 124. Started at 44, then 88, and a couple went to 124 but others keep turning. Does this mean they're stretching? The book says to go to 124 with no additional 90 degrees mentioned. The bolt heads have a T + 90 on them so what torque do I stop at? Have I damaged the ones that have kept turning? Probably 180 past something after 88 while looking for 124. Torque wrench is a Snapon that just came from calibration. It repeats good torques when I get them.