[Rails] same html elements rendering twice on page

hey all,

My index.html.haml:

- wrap do
- page_title "Teams List View"

application_helper.rb:

def page_title(title)
content_tag :h1, title
end

def wrap(&block)
concat(content_tag(:div, capture(&block), :class =>
"generic_header"))
end

I load in browser and get:
<div class="generic_header"><h1>Teams List View</h1></div>
<div class="generic_header"><h1>Teams List View</h1></div>

It's rendered twice. Not sure why. I invoke the wrap iterator, passing
a block into the argument list, wrap receivers it as a reference, then
I concat a div, use capture to render the page title as nested within
div, and assign div class. Not sure what I am doing wrong.

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