Dynamically creating columns prop for table, all headers are the same

I had an old script that successfully created the dictionaries inside of the columns prop to dynamically set the editability. Today I tried doing something similar, dynamically setting the headers. I put these extra lines of code in the same part of the script as where I set editability, but for some strange reason it changes all headers to the last alias retrieved from the database.

the code:

import json
import copy

	#clear the columns prop
	self.getSibling("Table").props.columns = []
	#get the table name from the custom prop on the root
	tableName = self.parent.custom.tableName
	#construct and fire a query to return the columns in the table.
	queryGetColumns = "Select columnName FROM MasterData WHERE tableName = '"+tableName+"'"
	columnNames = system.db.runPrepQuery(queryGetColumns)

	IsModifiable = "Select MasterData.modifiable from MasterData where columnName = ? AND tableName = ?"
	#make an array/list to fill with JSON objects
	propsColumns = []
	#load in the JSON format for columns prop
	columnJSON = json.loads(self.getSibling("Table").custom.columnFormat)
	i = 0
	#for every column fill propsColumns with a JSON object
	for row in columnNames:
		for column in row:
			print i
			params = [column, tableName]
			columnHasDropdown = system.db.runScalarPrepQuery("SELECT hasDropdown FROM MasterData WHERE tableName = '"+tableName+"' AND columnName = '"+column+"'")
			modifiable = system.db.runScalarPrepQuery(IsModifiable, params)
			propsColumns[i]['field'] = column
			#if the column ins't the identity column make it editable
			if modifiable:
				propsColumns[i]['editable'] = bool(1)
				propsColumns[i]['editable'] = bool(0)

			if columnHasDropdown:
				alias = str(system.db.runScalarPrepQuery("SELECT alias FROM MasterData WHERE tableName = '"+tableName+"' AND columnName = '"+column+"'"))
				(propsColumns[i]['header'])['title'] = alias

			#counter + 1
			#print propsColumns[i]['header']['title']
			i = i+1
	#populate columns prop
	self.getSibling("Table").props.columns = propsColumns

I used the console to check what was being writting into the header with prints, but those are all in order.

Does anyone have an idea what could be causing this?