CSS Not Loading On First Page Visit

After configuring LiteSpeed Cache on my WordPress site, sometimes when opening up my site the HTML will load without CSS for a split second before displaying the page correctly. This can be seen clearly when testing the site on GTMetrix, as the site preview shows the site without CSS. I'm unsure what settings I checked that causes this, as I disabled CSS Minify and 'load CSS Asynchronously', and the issue still occurs.

The site: https://www.genvisis.org/

Any thoughts?

Andrew C.