External audio recorder only gets left channel from iPhone via lightning port

Posted:
in iPhone
I'm trying to use the Apple Lightning to 3.5 mm Headphone Jack Adapter...:

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Lightning to 3.5 mm Headphone Jack Adapter

The Lightning to 3.5 mm Headphone Jack Adapter lets you connect devices with an audio jack to Lightning accessories. Buy now with fast, free shipping.
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plus a 3.5 mm Y-adapter / splitter to listen to my iPhone 8 and at the same time record onto an external audio recorder. Strangely, I get good stereo sound in my (hardwire, obviously) earpods, but only one channel is recorded on the recorder. I've checked that the recorder is not at fault: it records both channels of other sources.

Any ideas what the problem is and how to fix / workaround? Thanks

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