I found a guide to use a custom font on rev slider .. I made it .. but in chrome is ok but not is safari for example .. and on mobile .... https://www.lospiedorovente.it/webapp/
Sorry, but it is not really Betheme related question.
With that, you should contact the Slider Revolution, and check their official website.
I found that guide ... and working only with chrome ... :-(
Sorry, but the Slider Revolution is not our product, and if you followed their guide correctly, I would not be able to help.
In that case, you should contact their support instead.