Live photos have turned into 2-second videos?!

Hello,

I'm not sure exactly when this happened, possibly after importing photos to my MacBook Pro via the Lightning cable, but the live photos that had previously shown as exactly that in my photos, now show as 2-second video clips. How do I correct this glitch? I really want the original photos back! For reference, I am using an iPhone 6S 128GB with iOS 9.3.1