Clicks run hot and notoriously bleed into the FOH channel if your gain settings are too hot. I use the Alesis and SLM, as well. You need to balance your clicks between the tracks and metronome so they're the same, yet don't bleed...I know the struggle. Could also be your console. If it is known to bleed...a click will only make it more apparent.
I've had success with the volume level for the SLM click volume set at roughly 1/3 or under the O in the word "cowbell" above (the click sound I use). I just take the gain I need from the other end or channel output to my in ear monitor. You might need less...or can take more. If you send to much click gain...above peak or near peak on the input channel...the click will bleed no matter how good your console is. Again, they always do this...just gotta find your sweet spot.