That doubling scares me a bit.
You can still see all the buffers via the Data Window. Of course, if you have access to the indicator's source code, things become even easier. You just find the calls of
SetIndexBuffer()there and see which buffers are assigned which numbers.
On the image, all indicator buffers are visible in the Data Window - there shouldn't be any problem with that. As for the "Indicator not found" error, it has nothing to do with the buffers, it means that the given path to the indicator is wrong.