frozen wasteland's 'just a phaser'... unequal voltage range from left and right outputs?...

Does anyone know why there might be a 10x voltage difference between the left and right outputs from the 'just a phaser ’ module? … so when i plug them into the mixmaster it is hitting the red audio levels in the left channel but barely registering on the right . Maybe I am missing something or not understanding a concept that might explain this

, thanks