Hi Steve
I've downloaded a number of your projects over the years and have never had a misalignment though I am in the UK and am using A4 size paper.
The Bat however is not aligning in a number of places, and having looked more carefully at the outlines I think this might be a drawing problem.
In general the body does not align with the wings, the tail is not centre to the body (you can see that the curve on the RH side of the tail is not equal to that on the left), the shape of the upper wing 'fingers' do not match those on the body, and the cut outs on each wing are not in the same place - this last is not critical but you can see that on the left the cut-out structure aligns with the wing projections, but that on the right does not, nor does it align with the 'fingers' either.
I am trying to find a way to resolve these discrepancies, but feel it is better if I give feedback to see if the matter can be resolved.
Regards
Rob