If & Vlookup mixed formula only partly working

Please check the formulae you are given more carefully

=INDEX(Sheet2!$D$1:$D$6, MATCH(A1&C1, Sheet2!$B$1:$B$6 & Sheet2!$C$1:$C$6,0))

=INDEX('bill qty'!D2:D831,MATCH(B16&C16,'Receipted qty'!$A$2:$A$831&'Receipted qty'!$C$2:$C$831,0))

Huge thanks for pointing that out

Ok so now it's brought back several answes, though unfortunatley i don't recognise the figures its supplying

In one example it should have brought back an answer of 266.17, instead it's given a result of 1.41

Can anyone help me with what's happened here?