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I use Gutenberg FSE to build the website. After giving a title the custom font-size of 4rem, when I look in the Google dev tool, I can see an !important property after my style. What causes that ?
.has-white-color {
color: var(–wp–preset–color–white) !important;
}

You can use !important to override any previous styling rules for a specific property on a specific element. I prefer to avoid using it and rather target the specific element by using a parent class to override it. But it looks like the editor is using this just to be sure. Maybe this doesn’t happen if you use a parent class in your style. Or is the CSS added automatically?
Theme builders do that so that their styles don’t get overwritten by conflicting stylesheets.