Differences with own icons between Chrome and Safari browser

Hello,

when I was designing the website, I have used my own icons. I have downloaded svg formats from Flaticon and imported them to Fontello site app. I have made zip file and imported it into Enfold settings. It worked perfect. Today I wanted to add new icons, so I deleted the previous zip file from settings and did the same process as above through Fontello and imported new zip file to Enfold settings. And here is the problem.

When I want to use them in Chrome, it looks good and everything is correct even after publishing. When I open the admin page or published page in Safari, I see correctly only the old icons and those new are transformed into Chinese characters or are completely missing. And it is reflected even in result.

So if I open the page in Chrome, it is correct. If I open the page in Safari, those icons are missing or are different than should be.

Could you help me with that? Is there problem with importing or with browser? Or it is just misfortune and I it is not gonna work?

Thank you.
Best regards,
Jakub.