Originally Posted by kay

Transplanting always damages the root system a bit. It seems to kill quickly - ie if they survive the transplanting they thrive. No way of telling which colours didn't survive.

It is possible that you were sent duff seed, ie wild-type M incana. Try contacting the seed supplier.

I once grew a packet of Lychnis coronaria 'alba' only to find that they were the nasty magenta colour and not the white ones.