Click on top blocked domain [cws.conviva.com] on the Dashboard to go to Recent Queries (showing queries for domain cws.conviva.com). Select All from dropdown. List of blocked queries should be displayed (to help isolate client/source).
Pi-hole v.5.0 on Pi 4, Raspian, Cloudflared, no other Pi apps, privacy level set to "Show everything and record everything". Logs manually flushed about 28 hours ago.
Blank log is displayed. Clicking on Query Log (all) and using filter box or CTRL-F does not show a single entry for cws.conviva.com or other "top blocked domains", but other blocked domains are listed.