Summary: Pull Request resolved: https://github.com/facebook/yoga/pull/1487 X-link: https://github.com/facebook/react-native/pull/41691 The code here was just wrong. I changed it to be the same logic as the Justify:FlexStart case, but with the flex end sides. Then I get the position for the opposite edge since we need to write to flex start side. Reviewed By: NickGerleman Differential Revision: D51383792 fbshipit-source-id: 372835a44edff361dbd84dd92ff9f2ec844b9f9c