Why is text coming lighter in some sentences than in others

Hi, I am using Windows 10 and the greatest office, Libre Office. I am writing a letter and not copying or pasting anything and some sentence and even paragraphs are lighter than the others? I cannot seem to find any answer online so I came her. This is a professional letter and it isn’t acceptable.
I have not changed any setting in Libre Office, and this just started yesterday. I just wrote three paragraphs and suddenly in the middle of the fourth paragraph the text is lighter. If i select “Bold” it become just the opposite and darker. Any help would be greatly appreciated.

Select all text and clear direct formatting (Ctrl+M).
Open the Styles sidebar (F11) and choose a fitting style from there (Body text perhaps).


Thank you I will try that. I am a carpenter and technology doesn’t like me much. LOL