in header links I have been refering sui icon not fa, here is a sample
<a href="https://.../" target="_blank" class="social sui sui-meetup"></a>
I am guessing it is not calling fa by this way. I have changed home icon too, now fa.woff2 is not loading.
However something is still referring font-awesome-min.css. I have checked all css code again, still couldnt find what is referring to it.