Incorrect section titles in search

[vitaut]

Search results sometimes display incorrect titles. Here's a repo that reproduces the problem: https://github.com/vitaut/amplgsl-sphinx

How to reproduce:

$ git clone https://github.com/vitaut/amplgsl-sphinx.git
$ cd amplgsl-sphinx
$ make

Then open _build/html/index.html and search for "zeta". This will show the following search results:

Observe that clicking on any link leads to a wrong section, for example clicking on "The Weibull Distribution" opens "Special Functions".

[shimizukawa]

Confirmed. It also can be reproduced by using sphinx documentation http://sphinx-doc.org/latest/search.html?q=todo+items
It seems just searched titles are not correct.