Pay fixation

my initial appointment on may 1996 in 1200-2040 as health visitor after Vth p-commission grade pay 2400/- (5200-20200) after ACP G-Pay comes 2800/- in may-2008. Further my post has been surplus and i am appointed as clerk in G-Pay 1900 with pay protection after promotion in LDCE 20% as OS in G-Pay 4200/- my pay fixation  given 1400/- different but not given 3% of increment. so please tell me about my fixation is correct or wrong 

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