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I do some like TIS work. The reason for the timing difference is a function of the turn lane length. The timing of lights for a left turn lane is based on the opposing traffic volume, the # of trips using the turnlane, and the class of road (local, aterial, etc.). If there are turnlane restrictions that will not allow lengthening then the lights can be staggered to allow for more trips to go thru the light due to the insufficient storage.
My guess is the light was installed after the turnlane was in place and there was not room (or money) for lengthening the turnlane.
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