I just changed an existing website from the Polyon theme to Celestial Reloaded.
I’m using three of the four available “Bottom Widget” slots and they worked great until I defined the font size and color. Now, 2 of the 3 widgets display a large widget heading (which was not coded to change) but the first retains the original heading size (see attached).
Your first widget is using an H3 title heading within the content itself within an advanced text widget, while the others are using a text widget and the headings you see there are the actual Widget titles of the widget. Try changing the first one to a text widget and use the title field for the title.
Actually, I found this code:
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There’s a lot of tags that are causing some issues from what I can see, so you may want to go in there and change all that. The complete bottom2 container is wrapped in a font size of 4; not sure how that is showing there because that means it’s being put in there by a plugin or it was modified in the theme files. Might want to start fresh without those and then if you need your fonts resized, use css to do that.