Inconsistent data summation

Hi

I have a page with 5 repeating groups all using group by and summing the data. I keep getting different results even when I know the database hasn’t changed.

There are less than 500 rows being processed.

One explanation is that the computation is being done client side - I know the internet connection I was using was not good. So a possibility of data being lost somehow?

If on the other hand everything happens server side then this is quite worrying??

Any Thoughts out there?

Thanks

David