[Magento] Site is Always redirected to https. Need a programmer know how to fix the issue.

We found one of our extensions(Mageworx's template generator) generates several huge sql script and drives up our CPU usage. We decided to disable the cron tasks associated with that function via aoe scheduler and delete the old templates associated with the template generator. After doing all these, our frontend(only magento related part) is forced to redirect to https. And we checked our base url and it is the http version. We have to change the unsecured url(core_config_data) to https version, otherwise all the links on our website will get into redirect loop. We did not modified our .htaccess file and we don't think it is caused by the configuration of .htaccess Notice: We will provide site copy and database. Freelancers need to be able to do the project on their localhost.