Atlas marking doesn't persist

I’m experiencing problems with an atlas which should currently be marked (new sightings not yet recorded in Calflora). If I search from [] (, say, filtering on Myriopteris, it appears with “Active: true” and “Marked: false”. If I hit “refresh this atlas”, “Marked” changes to “true”, but it goes back to “false” as soon as I browse away from the page and return.