Lou
PIP is paid 4 weekly in arrears, most DLA claims were also paid like this but some are 3 weeks in arrears and one week in advance.
You need to wait until you have had' one full period of DLA, your last payment of DLA, your first payment of PIP and your first full payment of PIP, then you should be able to calculate whether you have had the right amount.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems