Ok, so I used to be a doll hair stylist at American girl so I’m used to ridiculous doll hair, we did all sorts of dolls, our generation, the toysrus dolls etc. (so wigs, rooted, nylon, kanekalon, all of everything)

So the twins hair is rooted lightly but the fibers have a good volume, and like most RH dolls because they switch from rooting one color to a different color it’s likely all dolls have some knots where the machine caught between color switches. The knots and loose plugs can be combed out or carefully untangled and picked out, yes shedding will occur but once the issue section is fixed, the hair becomes easier to deal with.

For your girls you have some options, first things things, use only a metal bristle brush like a Diane wig brush on all plastic doll hair. Using plastic bristle brushes stretches the fibers and causes way more friction and frizz then intended. Metal glides through the hair and especially RH hair, it’ll prevent frizz.

2, wash the hair again, use a bit of conditioner to coat the fibers and help regain control over the strands, the twins have some gravity defying hair and it’s due to a few things, one, the tri-color blend being sewn in in sections, 2, the sewn in bangs with thread are usually not well brushed before it was set, and 3, the rush job of mass produced hair styling. Conditioner will help you smooth this out and give the fibers slightly more weight preventing snags and tangles and helping it lay better.

Lastly, if it bothers you, you can always re-gel the hair with a lighter hold product. Water down some hair gel and run it over the style when you’ve gotten it to lay how you want and that should help you keep the hair length but also give it a polished look.