can not edit Content module

-- HikaShop version -- : 2.3.5
-- Joomla version -- : 3.3.6
-- PHP version -- : 5.4.35
-- Browser(s) name and version -- : chrome 39.0.2171.95 m

Hi:

I'm trying to customize my content modules but after I click on save button, the default setting apply again to the module.
I searched a lot regarding to fix this issue, if someone can help me how to fix it , I really appreciate.

attached you can find snap shot of what I am trying to fix.