RubyOnRails Bootstrap グリッドシステム　全て一つ目の列に入ってしまう

<div class="container">
  <div class="row">
    <div class="col-md-3">
      <div class="box">
        <% if @book.errors.any? %>
          <ul>
            <% @book.errors.full_messages.each do |message| %>
              <li><%= message %></li>
            <% end %>
          </ul>
        <% end %>

        <%= render 'users/user', user: @user %>

        <!-- form_with部分 -->
        <%= form_with(model: @book_new, url: books_path, local: true) do |f| %>
          <h2>New book</h2>
          <h4>Title</h4>
          <%= f.text_field :title, class: "form-control" %>

          <h4>Opinion</h4>
          <%= f.text_field :body, class: "form-control" %>

          <nav>
            <%= f.submit 'Create Book', class: "btn btn-primary mt-3" %>
          </nav>
        <% end %>
      </div>
    </div>

    <div class="col-md-8 offset-md-1">
      <h2>Book detail</h2>
      <table class='table table-hover table-inverse'>
        <tr>
          <td>
            <%= link_to user_path(@user) do %>
              <% if @user.profile_image.attached? %>
                <%= image_tag @user.profile_image.variant(resize_to_fill: [50, 50]) %>
              <% else %>
                <%= image_tag 'no_image.jpg', size: '50x50' %>
              <% end %>
              <nav>
                <%= @user.name %>
              </nav>
            <% end %>
          </td>

          <td><%= link_to @book.title, book_path(@book) %></td>
          <td><%= @book.body %></td>

          <% if @book.user_id == current_user.id %>
            <td><%= link_to 'Edit', edit_book_path(@book.id), class: "btn btn-sm btn-success" %></td>
            <td><%= link_to 'Destroy', book_path(@book.id), method: :delete, data: { confirm: "削除しますか？" }, class: "btn btn-sm btn-danger" %></td>
          <% end %>
        </tr>
      </table>
      
      <div>
  <p>コメント件数：<%= @book.book_comments.count %></p>
 <% @book.book_comments.each do |book_comment| %>
  <p><%= image_tag book_comment.user.get_profile_image(100, 100) if book_comment.user %></p>
  <p><%= book_comment.user.name %></p>
  <% if book_comment.created_at.present? %>
    <%= book_comment.created_at.strftime('%Y/%m/%d') %><%= book_comment.comment %>
  <% else %>
    <p>作成日時不明</p>
  <% end %>
  <% if book_comment.user == current_user %>
      <%= link_to "Destroy", book_book_comment_path(book_comment.book, book_comment), method: :delete %>
    <% end %>
  
<% end %>
                <% if @book.favorited_by?(current_user) %>
                  <p>
                    <%= link_to book_favorite_path(@book), method: :delete do %>
                      <i class="fa-solid fa-heart"></i><%= @book.favorites.count %> いいね
                    <% end %>
                  </p>
                <% else %>
                  <p>
                    <%= link_to book_favorite_path(@book), method: :post do %>
                      <i class="fa-regular fa-heart"></i><%= @book.favorites.count %> いいね
                    <% end %>
                  </p>
                <% end %>

</div>
<div>
  <%= form_with model: [@book, @book_comment] do |f| %>
    <%= f.text_area :comment, rows: '5', placeholder: "コメントをここに" %>
    <%= f.submit "送信する" %>
  <% end %>
</div>
    </div>
  </div>
</div>