Back button in Category view, when filtering retuns no items

I am loading xhtml, not html5.
I even tried with html5 by adding same codes but not showing.

Then you have a custom template that it is not calling this common file,
(in built-in template various files are just wrapper files for calling the common code in files in folder: tmpl_common)

so go inside your custom template and edit category.php

You mean that if I create custom template(blog or presentation), tmpl_common file won't be loaded?

If so, once you update this feature(or even other features) in tmpl_common file, do I have to recreate all my custom template that I created?

No no,

if you create copy of a these templates the category.php will load , just meant if you have an old template (prior to r1560 or something) that did not have the common template code moved into tmpl_common folder.

NOTE , at some point we will add multiple configurations per same template , to avoid duplicating template files , only because a different field setup is needed

Ok, then can you please explain how can I find out which duplicated template is older than r1560?

Simple ,

edit the category.php of yours and check if it has a single line that loads the respective file from tmpl_common folder.

If it does not, then just add the code i gave you in your this category.php of your custom template