Why does short pressing the left shift key switch the view mode in addition to increasing the throttle?

When flying a spaceship if I press left shift briefly and let go immediately it beeps¹ and switches the view mode² in addition increasing the throttle. If I long press it it just increases the throttle as expected.

Why does it take me into IVA view in addition to adjusting the throttle and how do I make it stop?

I thought it might have to do with Karabiner interfering with KSP but I disabled it and the issue still occurs.

I'm running OS X 10.11.3.

Here are the plugins I have installed in case they're relevant somehow:

KerbalAlarmClock
Docking Port Alignment Indicator
KerbalEngineer
EditorExtensions

¹As in a "you can't do that right now" beep.

²i.e. if I was looking at my ship then it switches to IVA.

macos kerbal-space-program

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What Is Power Shifting? (And Why It's A Bad Idea)

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Why does short pressing the left shift key switch the view mode in addition to increasing the throttle?

Pictures about "Why does short pressing the left shift key switch the view mode in addition to increasing the throttle?"

What Is Power Shifting? (And Why It's A Bad Idea)

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