Repair Solve in PS

Can anyone explain what is the behavioral difference between cold solve and repair solve in PS? I understand that repair solve will highlight the operations that were affected by the simulation changes that followed the repair action, but is there any difference in the scheduling output when we Repair solve as compared the cold solve?

Also, we are experiencing some inconsistent results when we repair solve, such as -

1. Operations scheduled during 'Delay Time' when delay time is added as a simulation event

2. Adding delay and repairing the model pushes all the operations at the end of delay period, whereas these should have been offloaded to alternate resources instead