Slackware :: The Bash Prompt Displays Twice?

I'm playing around with my prompt, and for some reason under certain conditions part of the prompt is output twice.

- When my terminal window isn't maximized it always outputs the prompt correctly.

- When the window is maximized it outputs the prompt correctly when I enter an empty command (ie, when I just hit enter).

- When it is maximized and I enter any command, it outputs the second line of my prompt twice.

I'm using urxvt.. I tested in xterm and it seems to work correctly, so I guess it's an issue with urxvt. My prompt code:

Code:

#!/bin/bash
function redblue {
local BLUE="[33[0;34m]"
local RED="[33[0;31m]"
local LIGHT_RED="[33[1;31m]"

[code]....