Arrow tips are missing

Just installed the before after slider. Works great. Only thing that seems to be wrong are the arrow tips on the separator line seem to be missing or off.
Please see screenshot.

https://dl.dropboxusercontent.com/u/39930/Website_bugs/twenty-slider.png

Not sure what could be causing this. I am using the Enfold theme with Avia layout builder. Not sure if that makes any difference.

https://wordpress.org/plugins/twentytwenty/