I am very confused, hopefully some kind person can help me?

I have a spreadsheet recording results and various information across a
spreadsheet.

So day 1 results and info are stored in A3,B3,C3........H3
day 2 in A4,B4,C4.......H4
last day in A1500,B1500,C1500......H1500

I have a function in K3 that uses the info in A3 to H3 to create a result.
This function is replicated down to K1500 and works perfectly in that I get
the expected results displayed.

However when stepping through with the debugger I see that the order of the
cells being calculated is very strange in that it goes
K3,K4,K1500,K1499,K1498........K5

THis wouldn't be a problem except that I now need to ensure that the cells
are filled out sequentially ie K3,K4,K5.....K1500

Anyone have any ideas?

Many Thanks

Kevin