How to remove additional empty column at the end of database

Hi there,
When running my script the IDEA seem to be creating additional column (empty column with no field name) at the end of my initial (master database). It happens after I run 2 function in which I add additional field to the database (those field is then removed at the end of the function).
The awkward thing is that when run each of the function individually the additional field at the end is not created.
Any idea why it does it.