I found an interesting problem.
I installed Cybage Products Swatches module and a Templatemonster template.
On localhost computer the swatch work but on host storage not.
If I look at rwd/default template and Cybage is active, I can see that e.g. the color swatch is double and one of is not good.
Why are there double? This site on localhost is good.
The color change when I select the size too.