Disjointed documentation interface in OS X

[rthoma]

Hi, I'm experiencing an issue on OS X, and other members of the /r/emacs subreddit are seeing it too. I'm using pos-tip with the company quickhelp package. On the github homepage for company quickhelp it shows this image, in which the documentation panel is basically an extension of the company completion menu. What I get instead (on OS X) is a little more disjointed interface that looks like this. It looks like this might be a bug in pos-tip, or potentially a setup issue. Are there settings I can change that will allow pos-tip to present documentation in a way that better integrates with the company completion menu?

For reference I'm running Emacs 25.1.50 (9.0) on OS X Yosemite (version 10.10.5).