Are you using the right feathers for the jig? Need to use right wing feathers in a RW jig, likewise left wing feathers in a left wing jig.
Then, if you're going to spiral or offset the feather, need to offset or spiral the front of the feather to the left if it's a left wing feather, to the right if it's a right wing feather. Need to have the right clamp to do this as well. A spiral clamp is used to spiral the fletching, a straight clamp is used to offset the fletch. Can use left or right wing feathers in a straight clamp, but must offset them in the correct direction.
The skinnier the shaft, the less you are able to offset or spiral the jig clamp/feather. Best to dry fit and adjust the clamp until you get good feather contact along its entire length with the arrow.