PHP MySQL update works then "disappears"(like a rollback)

[philliphanatic]

What could cause an updated field in a MySQL database to change back to its original value when no additional queries have been run?

 

I have an application where the employees enter all of their tasks which is used in generating invoices.

 

There are 2 tables involved for this function:

TASKS

INVOICES

 

The mgr selects all of the tasks he wants included in a new invoice.

 

The application does an "Insert" in the INVOICES table for the invoice, and performs an "Update" on the TASKS table.  For each task the mgr selected, two fields in the TASKS table are updated ("invoiced" and "invoice_id" both default to 0 when the task is originally inserted).

 

The insert and update work fine, I can look in the tables and see the changes to the TASKS records, and the application reads and displays these changes as well.

 

BUT... after a few hours pass (not sure exactly when it happens), all of the sudden the "invoiced" and "invoice_id" fields in the TASKS table are back to their initial value '0'.  The record that was inserted into the INVOICES table is still there, but the TASK update is gone.

 

I have 33 tables that I perform updates on in this application, and this is the only table in which this happens.

 

 

Anybody have an idea of what might be going on?