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Try not to use the font size selector. Unless you know what font sizes are used across the website, it could mean you simply select font sizes which may be larger or smaller than the text around it, but doesn’t match the sizing used across the rest of the website. This would be fine if you were creating an individual Word document, but a website’s styling should be consistent across all of it’s pages. Individually selecting your font size on a page per page basis is time consuming and can lead to inconsistencies
Use the Paragraph format option button instead. This is both quicker and ensures the formatting stays consistent
If you cannot decipher what formatting has been used to correct it, feel free to start again. Highlight the text and use the clear formatting button to restore the default size and font, and you . You can then simply start again from scratch and allocate your formatting as required