Hi Samuel. I tried version 14.5.3 (via F-Droid) and the same issue is occurring. If anything, I can now reliably cause it by pressing the power button to lock my phone, then unlocking. The article I had open disappears and the next unread article is opened. Thanks.
P.S. Is there an RSS feed or web page link that can be used to track the release notes for Newsblur Android app releases?