"Temperature MSL / ISA + 10" Does Not Make Sense, Units Wrong

Do you have the same issue if you follow the OP’s steps to reproduce it?

Yes

Provide extra information to complete the original description of the issue:

I’m struggling to make sense of what this “+10” even means. If I set the temperature to 59 degrees F and monitor SEA LEVEL AMBIENT TEMPERATURE via “Simvar Watcher” I see 15 degrees C (whist parked at a gate at KSFO). What is this “+10” supposed to be representing? And looking at the OP’s screenshot, how can this label also be “+10” when the units are set to C? That’s impossible. 10C isn’t the same as 10F.

If relevant, provide additional screenshots/video:

Screenshot 2024-02-16 085332

Screenshot 2024-02-16 085310