Mysterious doubling R.I. State quarter

I saved this from circulation 22July15 but found some odd doubling about 4 days ago. It's a 2001-D Rhode Island State quarter with doubling under the bridge in 4 places. Since single-squeeze die production kinda eliminated classic doubling I was surprised to see this because it really shouldn't be there:







Here's a better pic of the left span...



So is this some kind of design creep or die stutter? Anyone know what this really is? Any help would be appreciated...Spark.

 

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It's been raining and that is excess water running off the bridge.

 

It looks like a worn die to me.