Bug in Sporty's E6B?

[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.

 

[dmspilot]

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?

 

[midwestpa24]

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.

 

[RyanShort1]

Analog > Electronic

 

[dmspilot]

I think the left one is converting Total Air Temperature (TAT) to Static Air Temperature (SAT), that is why the temperature label is different.