The issue seems to be with Sitefinity v.4.1.X, when I checked #tab on other website, which are on SF v.4.1.X, they are also having the same issue:
http://www.rohmuscat.org.om/programmes/performances#tab-section (Sitefinity 4.1.1395.0 SE)
http://msdf.org/programs#tab-section (Sitefinity 4.1.1405.0 PE)
Meanwhile, if you check this on SF v.3.X or v 4.2, it’s working fine.
Website working fine with #tab:
http://www.du.ae/en/mobile/handsets/blackberry-mobile/tariff-guide#tab-section (Sitefinity 3.7.2096.2:1)
http://www.gazprom-energy.com/uk/products-services/gas/fixed-purchasing#div (Sitefinity 4.2.1650.0 SE)
Can you please suggest some workaround for this?