Walk Behavior head/body distortions

Not sure that this is the cause of your main issue, but I notice that your different views (Left/Right Profile, Left/Right Quarter, & Frontal) are not independent — which means they all share the same mesh. Try click the crown icon for those groups to make the independent.

I think the best solution was:

1. duplicate the puppet to make a walking version, and when the puppet needs to walk I switch to the walker version, and when walking is done, I switch back to regular 

2. To eliminate distortion/warping/detachment in the walking version, i merged a lot of the layers together. All the head elements were merged together (eyes, eyebrows, glasses, hair) and was merged with the torso. The arms and hands were merged too. The resulting walking puppet only has a torso, two arms and two legs. (I did keep the mouth separate so that I could have him talk and walk).

3. I used pins at the points where the arms and legs attached to the torso to eliminate detachment.

4. I reduced the strength of the walk cycle to about 60% and fiddled with the other parameters to get a convincing walk.

hope that helps

I don't have a solution, but turning on the yellow mesh in the scene window (icon is at bottom of scene panel) sometimes you can see things moving or not moving when you don't expect them. This can give a hint to the source of the problem.

I've just built a whole lot of these for the ElectroPuppet store (Flat Pack). Originally I tried creating a shared head that had head turner. I found that everything became really slow as I shared the head group with each view. Also - all the different head positions are difficult to line up with the walking puppet. The prebuilt walk can shift where you expect the head to be - so takes a bit of experimentation. Head turner during walking introduced too many variables.

I decided to have a separate fixed head for the walk views - as most times the puppet will want to face the walking direction anyway. I also didn't use any draggers on the hands in the walking puppet. I found these can easily get moved in another view and make the animation look really strange.

That doesn't directly answer your issues - but I thought I'd share my experience with this and how I dealt with it. You can see a video of one of these puppets walking here;

https://www.electropuppet.com/adobe-character-animator-puppet-store/flat-pack-casuals/

Best of luck,