The deformed pitchers look like bug damage, possibly aphids or slugs. Aphids are there and gone before you even see them, causing extensive damage to new pitchers starts. I use Bayer systemic insecticide on all my sarrs in spring as a preventative.
Exposure to herbicides can also cause deformed pitchers even in minute amounts. Surprising how far the smallest breeze can carry a spray and can even expose plants if you touch them with herbicide on your hands, I know from experience. I had a couple pitchers plants exposed and every new pitcher was deformed thereafter, but normal growth the following year.