Whenever you add manually formatting attributes (this is called direct formatting), these attributes take precedence over what is defined in the styles (paragraph, character, …).
Even if you later change the same attributes in the styles, manual formatting still overrides the style.
The only way to "unmask" style definition is to remove direct formatting.
- Select the range of text on which you want to act
Ctrl
+M
or Format
>Clear Direct Formatting
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Have you perhaps applied some direct formatting? If so, direct formatting will override the style formatting.
Apply
Ctrl
+M
on all your heading paragraphs (after selecting the whole content), this will remove any added manual formatting. After that, your headings will follow the style definition.Thanks for your responses robleyd, I edited the standard font sizes with the hope that it would update it everywhere after clicking on okay. Ajlittoz, thanks Ctrl+M does the trick.