PlayerPrefs.SetInt or GetInt make strange decisions

Hello i have simple get and set

Code (CSharp):

1. for (int i = 0; i < 20; i++)
2.         {
3.             PlayerPrefs.SetInt("Inventory " + i, inventory.Items[i].itemID);
4.         }

Code (CSharp):

1. for (int i = 0; i < 8; i++)
2.         {
3.             addItem(PlayerPrefs.GetInt("Inventory " + i));
4.         }

I add items by item ID these are the ids' 0,1,2,3,4,5,6,6,0,1 at save.
When i load them they are 0,1,2,3,4,5,6,6 the strange is that i dont have the last 0 and 1 it seems they are overwrote but the two id(6) are not overwrote so i dont know what happends


Edit: they cant be overwrite because i set the Key with loop index so strange

 

Your two loops have different conditionals (i < 20 and i < 8). Is that intended?

 

Oh man thank you so much i forgot to change it