It could be that the last person who pinned the spring didn't get it 'square'. The spring should form a straight line as it passes the pins. It should not have such a pronounced kink.
This is my take on what happenned to this spring.
Hairspring was replaced but the stud (end of the spring) was not located properly. When beat regulation was attempted, it maded the kink in the spring, drawing the far coils closer and probably pulling the coils out of level.
Look at the very end of the spring... you'll see a little 'peg' in a hole which also serves as to hold the end of the hairspring, if not placed correctly it will esult in spring being out of flat.
Can you pull the donor balance/spring assembly and compare them? This will show the relationship between the stud, regulator and coils.
Anil