I did all the suggested solutions online, resetting the thermostat etc.
None of them worked. I ended up buying a sensor and putting it in the
room for an accurate reading. After a some time passed, the thermostat
started showing the correct humidity ...
Same issue here. Suddenly one of the nest learning thermostats humidity
lvl jumped up 20 points to 71. Did a reset and did not fix the issue.
The room is reading 51 with my other sensor.