(RoboHelp 2015, HTML5) Glitch on Hovering over Index Keywords

I recently upgraded from RoboHelp 11 to RoboHelp 2015. When I now hover over the links within a keyword they sort of shake and create a movement. So, not when I hover over the keyword itself, but when a keyword contains multiple links to different pages, those links themselves visually shake. It can be quite hard on the eyes.

Has anyone else experienced this? Would love any ideas as to how I might be able to mitigate this little glitch.

Thank you!