Unite Revolution is 4.7. Joomla is 3.91.
I encountered this error when I needed to change some text layers. I researched the other public tickets and it was suggested that each slide be saved before editing. I not only saved the settings but each slide as well. I'm providing two images. One is what it looks like on the backend and one is what it looks like on the frontend. You can see the wording but it has NO formatting at all.
Attached files: Slide - backend.jpg Slide - frontend.jpg
Please update your Unite slider to the latest version which can be download from UniteCMS website