I've seen many rigify questions on this site, but none that explain something to this extreme. This model is freshly rigged with rigify. Any minor change in pose causes a large deformation, and nothing is consistent from any video or tutorial I have been following.
I understand weight paint, but it only seems to make the problem worse by introducing new ones.
Thank you for your help, and I hope something can be done about it. There is another model suffering from the same problems.