Cam:

Vacation; Be and returned but leaving again.

More than likley at some point in the past there was a serious data entry error that was either not caught or not corrected properly.

If you don't see some offsetting entry that nets this out to an appropriate amount then I can offer to have a look and see if I can see something. If there is an offsetting entry then it sounds like it was not made correctly. Without seeing the data it would be difficult to suggest what the correct fix would be.