I was cleaning my old bike and discovered my rear wheel is a little untrue. More importantly I noticed a pair of spokes on the drivertrain side do not contact at the crossing point.

The wheels are Mavic Open Pro with Ultegra hubs. It was a second hand wheelset that I brought from ebay.

Should I be concern? I was able to get wheel true with the spoke ranch but I'm concern if it is ok to ride.

I looked at my wife's bike and see all the spoke crossed and contact (on driver side). while mine has one pair of spokes that have an open contact. Any suggestion on how this can happen?

Thanks.