If any area you work on starts hopping and bouncing all over the place most likely you have a dent or ding that needs to be leveled or you have a glob of tar , grit or mud of some sort that needs attention before you move on. Once it's flat then when you roll the area you won't get those hops
View attachment 2164202
But it's also good to check the inside to see if you can see a high or low spot. Often turning the fender in good light you can see areas you may have missed. Following the line in the this you clip you can see where it needs rolling. Can you see it?
Only minor details left and off to the next.
Until next time !!
View attachment 2164205
Before and after...
View attachment 2164211
View attachment 2164212