Conflicts

Hi

I love your plugin but frequently, it brokes my site. I have another plugins like qtranslate, google maps ready, contact 7 and many others and I don’t know if is conflict with one of them.
I have 2 languages in my site, being english the default language. However, usually, when I click in one page, it appears in the second language. Then I have to deactive the plugin and activate it, but then, it brokes the font family of the whole site.

I need your help to solve this issue, otherwise unfortunately I have to remove the plugin because this happens very often.

Please help me

https://wordpress.org/plugins/wp-fastest-cache/