Jonpt

Hello im having a serious problem when i try to change a background.

My version is classicwb lite, i have a amiga 1200, aca1233n 40mhz, kickstart rom 3.1.

So my original theme is:

https://www.dropbox.com/s/qlwppn2qxzxbgrk/Photo%2009-09-17%2C%2021%2018%2051.jpg?dl=0

And when i try to change to other, take a look at the icons:

https://www.dropbox.com/s/qy1cwdgoe0n6w55/Photo%2009-09-17%2C%2021%2010%2019.jpg?dl=0

Can anyone help me to solve this situation? Many thanks