When you copy settings with a mouse (shift+click), the offset is copied incorrectly.
Far lane becomes middle, near lane becomes far
Steps to reproduce:
1. Place two inserters (duh!)
2. Change first inserter's pick up offset and drop off offsets no any configuration other than default
3. Copy settings to second inserter
4. Observe incorrect offset
P.S. Looks like offsets are inverted when copied. Up becomes down, left becomes right