Blunt-end troubles

[T.J. Young]

Hi,
I've got a bit of a problem, I'm trying to subclone a DNA sequence from one 
vector into another.  Unfortunatly, the MCS are not compatible so I'm using 
blunt-ended ligation.  Now this is a bugger at the best of times but every 
time I get some positive colonies, on inspection, I find that the sequence 
has gone in the wrong way round!!  Now am I just the Worlds unluckiest 
molecular biology student or could there be some kind of underlying 
phenomenon that's driving my ligation in this direction?
Cheers,
Tim ;-)