Sorting error on the W.A. Mozart page

[kalliwoda]

I just try to raise the point here again, because even such a small problem makes the works hard to find:

The two Piano Sonata that lead to redirects fail to sort correctly among the Piano sonatas, instead they sort before Piano Concerto.
See here as an excerpt from the workpage:
...
Piano Sonata No.20 in C minor (Mozart, Wolfgang Amadeus)
Piano Sonata in B-flat major, K.498a (Mozart, Wolfgang Amadeus)
Piano Concerto No.1 in F major, K.37 (Mozart, Wolfgang Amadeus)
...
As far as I can tell, no unusual space is included in the work titles to explain the sorting error.