The graph should be read not as an absolute value, but more as a "shape" - as it tends towards horizontal, then the weight of the wood is changing less and the wood is therefore dry.
There are periods on the graph shown here where the heater is not running (the two large dips and the later shorter dip) and where the fan speed is reduced (causing the smaller increases in the middle of the graph, as the overall temperature increases slightly due to the reduced fan speed).
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