I'm having an issue getting a report to give me the sum data I'm pulling via =GETPIVOTDATA on excel 2010

All the values are of the same type (number) and its fine to give me the total of the first half of the data, however one of the cells in the middle breaks it and my result changes to a ref error.

edit: even when I copy the results and paste them as values change all their values to currency and then back to number the issue still occurs

Any ideas on what may cause this?

Thanks,