weird case in drupal!

I have drupal 6.19. the Homepage keeps showing old contents. when i click Ctrl + F5 (hard refresh) i get the correct contents, and once i refresh again, i returned back to getting old contents.

I have disabled all Caching modules (BOOST and Memcached are disabled). also i d开发者_运维知识库ont have any reverse proxy caching service (Varnish, squid etc).

i have restarted apache many times as well as restarted mysql. also i have cleared all cached from admin panel.

the enabled modules in apache are:

alias.conf       authz_default.load    autoindex.conf  dir.load      headers.load      negotiation.load  setenvif.conf
alias.load       authz_groupfile.load  autoindex.load  env.load      mime.conf         php5.conf         setenvif.load
auth_basic.load  authz_host.load       cgi.load        expires.conf  mime.load         php5.load         status.conf
authn_file.load  authz_user.load       dir.conf        expires.load  negotiation.conf  rewrite.load      status.load

anyone faced this issue before?? any idea is really appreciated.

Best Regards

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Drupal has inbuilt caching mechanisms. Check your settings at administer>site configuration>performance. You can flush all inbuilt caches on that page.