What format did you export as?
My WAV files were edited from stereo to audio with Audacity
I don’t know anything about Lightworks. I looked at the website and it shows a variety of audio/video “container” formats, but I don’t see what audio formats you can import. WAV should work with most video editors and since 48kHz is “standard” for video, try exporting as 16-bit 48kHz.
This seems like a Lightworks problem… Have you posted a question on the Lightworks forum?