Bug in Sporty's E6B?

Hengelo

Pre-takeoff checklist
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Aug 31, 2021
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Hengelo
Long shot here; why do you suppose these two functions that take the same arguments, return the same answers, have such different calculations?
link to the manual here. Pages 20/21 relevant.

IMG_1417.PNG
 
Zero degrees C at 10,000 is warmer than standard so the left one can't be right, at least as far as density altitude.

Why is the temperature label missing from the left one?
 
I'm going to guess that it has to do with the temperature input on the right screen. You have 0C as the temp, which is below ISA at 10,000 feet.
 
I think the left one is converting Total Air Temperature (TAT) to Static Air Temperature (SAT), that is why the temperature label is different.
 
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