Cant make formatting changes in Spirit theme

Ok Im having some problems editing text elements. Whenever I highlight a piece of text and attempt to change it it applies my change to to the first item in the text box leaving the highlighted areas untouched.

Ive attached screenshots that illustrates the process.
As such Im finding it impossible to really do anything with the theme.

Ive tried different browsers, on a local host and the problem is the same. Am I missing something obvious?