Snap !! I had to reply at different post and i put the detail answer over there whereas i wanted it to be here
Well first thanks to ForceHSS ...
Solution for this was suggested by him, which was install a unmodded default style. How you do that is as follows;
Go to Styles & Templates/Style Manager at the bottom you will see a link that says [Add New Style] it will open a new window
Parent Style = No Parent Style
Title = put whatever you want
Allow User Selection = No as this is only a test members don't need to see it
Display Order = 1
Then after that issue was gone. After that i deleted all custom styles and re installed them and now i don't even have issue in them either and hopefully it won't come back again
Once again thanks to all who helped and special thanks to Force for helping me solving this issue.