[smw]

 Let me ask you this - was the sorting in the collections editor incorrect like it was on the library screen (with S, TE, CH, SO, TO, etc)?

No, within the collections editor things looked normal.

I know the original bug occurred in the older code base for the original MobileSheets, but the collections editor part of the problem matches the original symptoms exactly; since there was a clear link to the article sort then, it seems likely to be related now even though the code is different.