No Style in Sidebar

Hi,
first of all: Great Plugin you have made! My Problem is the follogwing:

When I add the Ragings-Widget to my Dynamic Sidebar, there is no Style in it. Even when I switch my Template back to the WordPress standard, it looks the Same. I have already deactivated all the other Plugins I have installed. Can you help me please?

https://image-upload.de/image/8AjJpz/38ab2c7e27.png

https://www.ads-software.com/plugins/wp-product-review/