Calculation help

I am having a difficult time with a calculation. I took over someone else's duty who is no longer with the company. The calculation used did not account for entire columns & the data I need to pull fromhas grown larger than the calculation. When I hit "F2" to manually change the data array, everything works fine until I hit enter and then the result displays as 0.0%. When I hit the insert function button, the result shows as the correct number. I tried copying the format only from an adjacent cell, but this did not work. When I tried to undo my changes, the cell still displays as 0.0%


The original calc is:
=SUM(IF(cData!$T$2:$T$45998="Internal",IF(cData!$N$2:$N$45998=9,1,IF(cData!$N$2:$N$45998=10,1,0)),0))/SUM(IF(cData!$T$2:$T$45998="Internal",IF(cData!$N$2:$N$45998<>"",1,0),""))

The new calc is:
=SUM(IF(cData!$T$2:$T$65536="Internal",IF(cData!$N$2:$N$65536=9,1,IF(cData!$N$2:$N$65536=10,1,0)),0))/SUM(IF(cData!$T$2:$T$65536="Internal",IF(cData!$N$2:$N$65536<>"",1,0),""))

The calc from the cell below the cell I am working in:
=SUM(IF(cData!$T$2:$T$45998="Internal",IF(cData!$O$2:$O$45998=9,1,IF(cData!$O$2:$O$45998=10,1,0)),0))/SUM(IF(cData!$T$2:$T$45998="Internal",IF(cData!$O$2:$O$45998<>"",1,0),""))

I am not sure what I am doing wrong & would appreciate any help!