Having issues with trying to change style in Robo11

Having an issue with Robo11 allowing me to change a style in a topic (document imported from Word) that already exist in the style css. Robo allows me to scroll down, but immediately jumps back to the top. This has only occured on 4-5 projects out of over 50 projects. Have tried more than one way to change style, but continues to jump to top of style type list.