Seems to be an issue with the way numbers larger than 32768 are imported into AE from a CSV file for data-driven animations.
Steps to reproduce:
1 - Import CSV with numbers smaller and larger than 32768 and add to comp.
2 - Drag out Number data from CSV to composition.
3 - Notice that any numbers larger that 32768 are imported as being "32768" (E.g: Number data point should be 40,000, imports into AE as 32768.
The control seems to be limited to the signed integer range. I think you should report this as a bug!
If you access the value like this in the place you need to use it (replacing column and row with your actual cell address and remembering the first cell is [0,0], not [1,1]): footage("Book2.csv").dataValue([column,row])
you will get the actual value, not the clamped one.