As per the screenshot it doesn't look like a Label for me, as it is displaying the Rich Text Editor. Basically Label will display the provided text and it won't have RTE control as shown in my screenshot. So i suspect its not a Label, could you go to the corresponding section using LiveUI and see the exact control being used to display this UI. If not kindly share the screenshot of your section rule whether this control has been used.
Can you show us the screenshot of your Label rule and the display of the Label rule in the section.
Try to add a Label in any sample section and enter the text to be displayed in the field, then see how it is displayed in the section preview. For me it looks like the label is not created properly at your end or you might be ending up with creation of wrong rule instead of label.