This could be a known bug, but I think it's worth mentioning as it still occurs in the latest patch:
When selecting one or multiple engines, some changes made to one engine will carry over to any and all engines selected afterward.
As a practical example, in an aircraft with running engines, select #1 and set the magneto's to off, effectively stopping the engine.
If the #2 engine is then selected, the magneto's for this engine will also be set to off, killing this engine as well.
This "carryover" happens with a number of controls. I've tested it with Magneto's and radiator settings(Open/Closed).
Prop pitch has a similar issue: Set #1 prop pitch to 20%, switch to #2 which is at 100% and decrease prop pitch.
Rather then decreasing to 95% as it should, it will switch to 15%. So the value it decreases from is the one last set.
I'm assuming Mixture will have the same problem.
There are exceptions however: Prop feathering and fire extinguishers do not exhibit this behavior.
My conclusion is that the problem occurs only with incremental controls, I.E. controls with more than two settings.
A possible cause for this is the system reading the variable that was last changed, rather than the one for the currently selected engine.
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