I have problems with my banners. I am using Numerology template and I changed the banners with pictures that are more appropriate for my website. I have discovered that for every banner I upload the File manager automatically saves a smaller size one. Later on, I wanted to "arrange" some of them with Picknik so I chose the smaller size ones from my File Manager and edited them. Now after changing the banners with the new small size edited ones I saw that even if the banners look normal on my laptop, they look very poor (pixelate) on my husband's new laptop. I am confused because I do not know if I did something wrong. I tried to change my newly edited banner (small sized ones with the uploaded big size banners but uploading does not work. Why?