Hey,
I had the same issue. This is actually a known bug on iOS that sometimes occurs when using the Delay JS. This bug causes links to not work until they are clicked twice.
I fixed the issue adding a Hook element:
Hook: wp_head
Location: Entire Site
<script src="https://cdnjs.cloudflare.com/ajax/libs/fastclick/0.6.0/fastclick.min.js" integrity="sha512-oljyd1wg75alHReTpDvNIQ4Yj1wZwGxxZhJhId3vr2dKY+26/r/wmMrImwDgin03+7wxyhX+adOQB/2BTvO5tQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script>if ('addEventListener' in document) {document.addEventListener('DOMContentLoaded', function() {FastClick.attach(document.body);}, false);}</script>
More details here => https://perfmatters.io/docs/delay-javascript/#ios-double-click