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Legacy 24bpp DDS files are being converted with R and B swapped.
The DirectXTex library expands legacy 24bpp files automatically since there is no DXGI equivalent format. The existing code, however, converts them as if they were RGB data, when in fact they are BGR.
This can be verified by looking at the color masks:
R: 00ff0000 G: 0000ff00 B: 000000ff A: 00000000
Attached is an repro image. If you load it with DirectXTex, the result looks 'bluetoned' instead of normal.