In most puzzles, there's always some helix that won't rebuild. In a recent puzzle it was part of the puzzle-specific setup. But it happens all the time.
In 861 I made a big helix and it just won't rebuild. If I use tweak, it stops tweaking before it's straight. When I got it mostly correct, tweak bent it 90 degrees and then stopped.
Maybe there's something wrong with the puzzle setup again. Or maybe there's something fundamentally wrong in your resources.
I've shared a solution to 861 called Helix rebuild. I'd like you to try rebuilding, tweaking, and wiggling 34-40 EQVHILY. If you can find out why these won't rebuild or tweak into a helix, perhaps you can fix the entire problem.
I'm playing in main client 20140213-f6ad820032-win_x86.