When I set text boxes to change states, residual image of previous state is left over

Hello. I'm working on some courses that require that I call out text with visual indicators (colors, boldfaced, underlined etc). I do this by setting up triggers that change the state of the text boxes at certain points on the timeline. I've been experiencing some issues with this. Sometimes, it just doesn't work, and sometimes, there seems to be some residual image from the previous state left over on the new state (see screenshot). Has anyone experienced this and have you found a workaround?  

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