Maybe try just using the “es2016,chrome58”, drop the rest, and see how it is on Safari? That has worked for me when I converted from scss to vanilla css with variables and I haven’t had any issues with real iphones/ipads.
tj0
coen.bakker
coen.bakker
tj0
Yuck. Possibly could just be the css itself not being supported by Safari? Sorry, no other ideas. 
0