Scott, we have seen this issue occasionally happen with Plantower laser counters before, and we believe it’s an issue with the firmware implementation of CF1 and ATM in the laser counter (firmware we don’t have access to). Try getting the Alt-CF3.4 data instead.
We’ve got a new map coming soon, and it will display Alt-CF3.4 data by default, with the option to switch back to ATM/CF1 (corresponding with outdoor/indoor sensors).