By that I mean that you need to click the linked object right in the middle of the linked object; clicking to the right or left does not work.

I've put these object in a div - could this perhaps have something to do with it?
<div class="two-tiles-3-3">
<div>
<h4 class="Heading4" style="text-align: center;"><a target="blank_1" href="Analysis/235_Analysis API.html">Analysis APIs</a>
</h4>
</div>
<div>
<h4 class="Heading4" style="text-align: center;"><a target="blank_2" href="GIS/235_GIS API.html">GIS APIs</a>
</h4>
</div>
</div>