After adjusting the xSize and ySize of my GUI and loading a new image, I randomly got a stretched look on it. Changing the GUI image back to the previous image and sizes still didn't help the problem, and it now seems to be stuck stretched.

My GUI code:

 

 

package ccreations;

import net.minecraft.client.gui.inventory.GuiContainer;
import net.minecraft.inventory.Container;

import net.minecraft.client.gui.inventory.GuiContainer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.util.StatCollector;

import org.lwjgl.opengl.GL11;

public class GuiPrepTable extends GuiContainer {
private TileEntityPrepTable table;

public GuiPrepTable(InventoryPlayer inventoryPlayer,
		TileEntityPrepTable tileEntity) {
	super(new ContainerPrepTable(inventoryPlayer, tileEntity));
	this.xSize = 230;
	this.ySize = 219;
                //This is the same size as a beacon's GUI
	this.table = tileEntity;
}
@Override
protected void drawGuiContainerForegroundLayer(int par1, int par2) {		
	String herp = Integer.toString((this.width-xSize)) + "/"
			+ Integer.toString(this.height-ySize);
	fontRenderer.drawString(herp, 8, 6, 4210752);
	}
@Override
protected void drawGuiContainerBackgroundLayer(float par1, int par2,
		int par3) {
	int var4 = this.mc.renderEngine.getTexture("/ccreations/ccgui/preparation_old.png");
        GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
        this.mc.renderEngine.bindTexture(var4);
        int var5 = (this.width - this.xSize) / 2;
        int var6 = (this.height - this.ySize) / 2;
        this.drawTexturedModalRect(var5, var6, 0, 0, this.xSize, this.ySize);       
}
}

 

 

 

What the GUI looks like:

 

 

maybe check the dimensions of the image? that has gotten me more than enough times

I do think that is the problem. I noticed how every single GUI used by vanilla Minecraft is 256*256, so whatever is rendering the images probably just goes like NOAP SQUISH IT IT'S EVIL whenever it sees an image with dimensions other than 256*256. Thanks anyways for helping.

 

actually the variables xSize and ySize need to be the size of the part of the image that ISN'T blank