ColibriWP is 100% mobile mobile-friendly, so there is no need to use a mobile theme plugin or to enable the Jetpack’s Mobile Theme feature.
Sometimes, however, the Mobile Theme feature from Jetpack is automatically enabled or by mistake, and your website may look like this:
You can disable this feature from Jetpack Settings page, from the Theme enhancements which is located in the Writing tab:
Find the option “Optimize your site for smartphones” and turn it off.