Wall Condensation from Washer

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Two years ago I remodeled my two floor home.
On the second floor, next to the main bath,
I installed an over/under washer/dryer combination.
I installed a pan under the unit in case of overflow which
drains down a plastic hose to the basement. The main washer
drain, along with the drains for the bath and shower and the
supply water lines run down a wall (all within about 2 feet
of each other) which on the first floor is behind the
kitchen sink.

The problem is that when then upstairs washer is used for approx.
3 loads, I am getting condensation on the ceramic tile wall
in the kitchen in the vincinity of the drains/supply lines.

Can anyone tell me why I am getting this condensation and
what I should do about it? Is this indicative of a leak
in the drain line, improper insulation or venting?

Thanks