C22. My site is missing all/most of the colours / My site lost colours after modifying theme settings

This is most likely caused by a poorly written plugin that is loading it’s functionality on top of the theme’s own code.
First off, navigate and click on one of the theme’s colour fields – notice if two colour selectors pop up instead of one. If the answer is yes, then you will need to figure out the problematic plugin (by switching all plugins on/off) and disable it.
Secondly, check that all the colour fields have the leading ‘#’. If not, add it back where it’s missing and save settings. If the # sign is removed after the save, this may also be caused by a plugin. Switch all plugins off/on to check for the culprit and disable it.