Radius callout not touching part in drawing

Any ideas on how to touch the leader arrow to the radius feature instead of it floating off the part on the inferred circle (see image, below and attached)?  It doesn't always do this.  I've just been using a note with a leader when the problem arises, but I can't justify that much longer.  There has to be a way-- it just refuses to go around the inferred circle and touch the part edge-- no matter where I move the callout-- even if I swap the side of the arrow...