I have checked your website, and the icons are loading correctly on my end.
See Screenshot for clarification: https://ibb.co/svC3RFRk
Since the issue only occurs on certain devices, it is likely related to caching. Since you’re using WP Rocket and LiteSpeed Web Server, clear the cache from both WP Rocket and LiteSpeed Cache.
Let me know if the issue persists after these steps, and I’ll be happy to assist further.