The charts refresh to default settings during the periodic page auto-refresh.
Repro:
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View Thermostat or Sensor Detail Charts and toggle on settings that are off by default; e.g. on the Sensor Detail chart, turn on the “Indoor Temp” line, or on Thermostat Detail, turn on “Indoor Humidity”.
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Wait for the automatic page refresh.
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When page refreshes automatically, chart settings revert to defaults; i.e. if you turned on “Indoor Temp” on the Sensor Detail chart, or “Indoor Humidity” on the Thermostat Detail", those revert back to turned off again.