Hi Dylan,
Usually when something like that happens and parts of the text don't display, it is because of some stray/broken formatting codes. Maybe you cut and pasted text and got the opening code but not the closing code, or in the process of editing the text also deleted part of the formatting.
The text being marked red is the editor trying to say "There's something wrong with this text!" but it's not very specific with a solution.
However, the RCE (editor) has a very useful "Clear formatting" tool, and if you select all the text and then click that, it will clear out any existing formatting:

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