Analyzing - RSS feed not showing articles in App


New Member
Hi everyone,
Recently the WordPress install related to an app here was switched from Apache to LiteSpeed server. Feed URIs are perfectly valid as inspected by W3C feed validator - however the app's feed module is not returning any content.
Tried by simulating with another WP Feed hosted in Apache, and worked perfectly. Anyone else noticing such error or is it only me? I tried with multiple websites on running on Apache (cross checked with wapplyzer (even the ones I didn't own) and they are working fine.
Thoughts? Findings?

Many thanks.