It's not a "BUG" Most forums and even sites are not compatible with mobile phone browsing. That's it.
If you are having some problems with your browser, simply change it.
Download Opera or Firefox is it's available for your cell.
edit: I thought to try it in emulator.. http://www.browserstack.com
but defy isn't there
Ps: I think theymos should get a theme coded for mobiles as he doesn't wants to install tapatalk.
Something like this http://smf-media.com/community/?thememode=mobile