Does your audio sample rate in the source clips match sequence settings?
Source Audio Format: 48000 Hz - 16 bit - Stereo
Project Audio Format: 48000 Hz - 32 bit floating point - Stereo
Does this match?? It's a bit to technial for me.
They do match, but try putting a 2 frame audio dissolve on the cut. You won't hear it, but it should eliminate the click.