Pi reports wrong temperature

Just curious if others have seen this, but I have had two Pi’s (out of about 20) report higher than expected temps. When I take a laser heat gun and check the temp (with the cover already off when the high temp was reported) I find it is actually quite normal. Example: Report is 57 degrees C, but laser reports 36-40…similar to the other pis on the rack. Do the sensors sometimes fail like this?

73, Adrian VE7NZ

I think the reported CPU temperature is the on-chip sensor. That is not something you can measure from outside the package.

Ken