Higher ambient temps perhaps.
OP said they're normal earlier on but with those results it reminds me of those girls at my work which put aircon on 28degrees and when it drops to 26 they say it's cold so I guess just 'normal' is quite personal answer !
I'd say just take the chip out, grab something straight ( knife / ruller ? ), put it on the chip and see if the chip HS is even since we ruled out the cooler.
Can it be also that just the sensor is screwed?