Dynamic checkboxes to send array to controller only sending first choice

I have a table of data created like so:

<% @products.each do |product| %>
<tr>
  <td><%= form_tag push_to_products_path(product), :id => 
  'submit_products' do  %>
      <%= check_box_tag('send[]', product.sellersku) %>
  <% end %>
</td>
<td><%= product.title %></td>
<td><%= product.asin %></td>
<% end %>
</tr>

I created the nested form_tag because I have a button outside of the form that uses the checkbox data to send to my Product controller. This is the button code:

<div class="row pad_bottom col-md-4 col-md-offset-1 text-center">
  <button type="submit" form="submit_products" class="btn btn-primary">
    <span class="glyphicon glyphicon-upload" aria-hidden="true"></span> Push 
    Selected Products
  </button>
</div>

The checkboxes are correctly created in the view, but when I test only the first box has the sellersku value.. all the other checkboxes don't pass anything. They should also be passing the sellersku.

Pretty sure its my loop, just not sure what I did wrong??