sometimes with uncalibrated DSLR files, there are so many hot pixels that starAlignment sees only those pixels, interpreting them as stars... and since they are all in the same place on every frame, the alignment is a no-op.
so try re-aligning your files, but look in the star detection section of StarAlignment and increase the noise scales / hot pixel rejection and see what happens. when you look at the console as SA as running you should see some real dX and dY values instead of just a bunch of dx=dy=0...
rob