Visual flickering when cursor hovers over targets

I have been looking around for another post with similar problems but so far nothing. My game runs fine but when the mouse cursor hovers over any highlight-able target such as a turret, minion, or champion, the target model starts flickering. Everything else remains the same. There is no dip in fps but the flickering will not go away until the cursor moves away from the target. I have tried changing the resolution, changing the display settings, and going into windowed/borderless mode but the flickering remains. I am playing on a 2011 macbook 15-inch with High Sierra 10.13 macOS installed on it. Does anyone have similar issues or is this just me?