Button with broken href appears on pages

Hi

I am having a weird problem with my site measuredability.com

The pages are all coming up quite weird, the background image on the first section is missing and I see a whole lot of the text is underlined as if it is linked when I hover over it. I have gone into the page source and the pages seem to have a button with a href that is not written correctly at the top of the page below the header. See this from view-source:https://measuredability.com/recruitment-agency-cape-town/:

<!-- end header -->
</header>
<a class="btn btn-warning"
            href=">
             https://measuredability.com         </a>  		
	<div id='main' class='all_colors' data-scroll-offset='55'>

	<div id='av_section_1' class='avia-section main_color avia-section-default avia-no-shadow avia-bg-style-scroll  avia-builder-el-0  el_before_av_three_fourth  avia-builder-el-first   container_wrap fullsize' style='background-repeat: no-repeat; background-image: url(https://measuredability.com/wp-content/uploads/2017/05/Greys-Background-even-darker.jpg);background-attachment: scroll; background-position: top left;  '  data-section-bg-repeat='no-repeat'><div class='container' ><main  role="main" itemprop="mainContentOfPage"  class='template-page content  av-content-full alpha units'><div class='post-entry post-entry-type-page post-entry-9159'><div class='entry-content-wrapper clearfix'>

But now I can’t see that button on the backend. It seems to be below the header, but above the first section? I thought it had maybe been inserted by a plugin, but I disabled plugins one by one and it didn’t seem to fix it. Any idea how I can figure out where that button is coming from and how to fix the href?