Bullets Not Showing up

Hello, I am having an issue where some of the contents in a bulleted list are not showing up on preview. The text is vertically aligned to Middle and animated to fade in by paragraph. The real challenge is this seems to be an intermittent issue. From slide to slide it can work or not. Sometimes it works to align the text to the top and the problem goes away, but it has also still not shown some of the content with the top alignment. I have seen it remove text from the top of the list and from the bottom. Any ideas what might be going on?