I think he means the wing joiner tube that extends out each side of the fuse which the wings slip onto is not allowing the wing to slide fully on and there is a gap between the fuse and wing root section.

Questions:
Is it one side or both wings showing he issue:
What is the distance between the fuse and wing root.
Does the rod get secured in a stationary manner or is it able slide left and right prior to the wings being installed.
Do the wings have a tube for the rod to slide into?

If the gap looks to be the spacing of ribs then it's not seating to full depth in the wing. If its both wings it may be a manuf issue.