Sometime in the past, I must have (wrongly) set up a global style for links. Every time I create a link, the text-editor uses whatever it is I did as a global cover, thus overwriting the Style in the Typography section. Is there something I can do to fix this past mistake?

To my knowledge, there isn't anything you can do to set up any global rule that follows you from one project to the next. You start with a blank 'main.css' every time you start a new project. The only thing I can think of might be some component that you import into every new project, in which you may have set up something.

Or, if you are talking about links within the same project, you may be able to override whatever it is by giving it a new class name. What exactly is happening that you don't want to happen?

Are you talking about an existing project or a new one.
If it's an existing project maybe it's set as a symbol in which case unlink the symbol on the new link in order to change styli g

I just tested by creating a new project and it is consistent with what I see in my current project.

When I am in Text Edit Mode-Paragraph and create a link in Inline Elements, it always colors the font with #1779ba and no underline. Maybe that's the standard, but I thought it used a different color originally.

I also looked for any symbols that would cause it and it does not appear to be there.

That IS the standard. Normally, you style links outside of the text editor. If you have a paragraph and some words of it need to be styled differently, e.g. as a link, you need to select those words and then you can add colours and underline, change the font, size or whatever.

Thanks Inger! Now I know it's nothing I did.