Accepted answer

This is because now the latest bootstrap refers to v4 in the link

You need to change your link to where you have been including stylesheet most probably /public/index.html or just search through files where you are importing bootstrap from cdn and change it to version 3(3.3.7 in my case), because react-bootstrap(Navs, NavItems or any other components ) uses bootstrap v3 css


Change this: ]

<link rel="stylesheet" href="">

to not lastes version, for ex.

  <link rel="stylesheet" href="" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

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