For some reason in the apps (I've tried desktop and iOS, can't tell about others), it will render all occurrences of a highlighted text with the highlight background.
For example, I highlighted the word "Effects" and the app correctly shows there's only 1 highlight, yet it renders all the occurrences of such word as highlighted text. Even when there's separated words like in the text "Effect Step 1". (Which is an error I reported at https://raindropio.canny.io/bugs/p/highlighting-incorrectly-highlights-different-text)