This isn't stringing - the pattern is regular. This is a purposeful support layer. *and* it's visible in Cura. In cura you can slide the layer slider on the right side down until you can find the problem layer. DO NOT print anything until inspecting the layers first.
Robert's suggestion, although it may sound bizarre, is very very likely the fix for your problem.
Try going into the expert settings: Expert -> Open Expert Settings On the bottom right of the pop-up there's a group of settings called "Fix horrible", the first box is ticked, right? Try unticking it and have a look at the layer view again.
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