Tiled galleries not working with Responsive Theme

hi – tiled galleries in thumbnail sizez doesnt disply properly. Displays in different sizes. I have activated Carousel and Tiled galleries, tried to delete and re-install Slim Jetpack, but it doenst help. It is on a REsponsive Theme site. I have another Respohsive theme site where it works no problem.

What havent I done?

Thanks in advance.

https://ww.wp.xz.cn/plugins/slimjetpack/